Keranu, those SFII updates to acade pcbs were just that: updates. The practice is common to this day.
I understand they were updates, but I argue that they were obsesive with their updates just for one game. Championship Edition was a great idea, as I said with Fatal Fury Special, it gives the players the chance to play as the boss characters as well and you know there is always a nerd who is gonna choose the bad guys

.
But then there was SF2 Turbo, which from all I understand added the option to let you change the speed and if you ask me, that's a ridiculous feature for a seperate update and should've been included with another update. Then there was Super, which I liked becaues it added more characters, albeit silly characters, but a fun feature even though I think this should've already been already included with CE. However Super didn't include the speed adjustments from the "Turbo" verison, so yet that leaves room for another update; SUPER Street Fighter II TURBO. I did like how this game added super moves, but once again I feel this didn't need a seperate update, not to mention it's butchering the title name

.
Its like adding content to an Xbox 360 game with a download. Its a bonus, not something negative. It still cost a quarter to play.
Those are just downloads, so it's more understandable for me to see updates like that. However by milking out SF2, this gave Capcom the chance to sell different versions of SF2 to arcades again and again to ensure it would never get old. From a business point of view, it's quite brilliant when you think about it since it creates more exposure for their product and name by having multiple SF2 cabs in an arcade for an extended period of years but from a gamer side, I just see this as a gimmick. Capcom still hasn't stopped milking SF2 as they released a compliation of all the versions in a arcade cab a few years ago which allows arcades to charge more quarters for it since it's a new game. Heck now they are even making SF2 in HD!

How publishers decide to put out home ports is a different issue. But the 3 home versions of SFII on SNES offer way more with each version than what is acceptible with sports titles and each one was still the best fighting game as they were released(during history's biggest flood of fighting games).
I'm not going to argue with you about sports titles like Madden being released every year because those are just as guilty, but I still feel that the home versions of SFII didn't feature all that much of a difference.
Mortal Kombat is way worse a series for unnecesary sequels than Street Fighter II. Plus, how many King of Fighters and Metal Slugs are there that recycle elements from previous games?
Though I'm not a Mortal Kombat fan, I don't really recall the 2D series being milked. There was MK 1 - 3 and they felt like real and improved sequels.
Now I already posted about the KoF series. From '94 - '98, the series made LOTS of improvements and at least SNK actually added years to the end of the title instead of constantly adding new words to an already made title (SUPER STREET FIGHTER II TURBO!). Just compare the gameplay from '94 and '97 and you'll see the big jump in improvement. Not only that, but the games weren't updates like the SF2 series but actual sequels. Each game featured a new story, new characters, new moves/supers (or DMs/SDMs if you prefer SNK lingo

), new backgrounds, and new music (both new compositon and updated songs). I'm sure SNK thought the yearly KoF would make good profit and all too, but unlike games like Madden, they actually made consistent improvements and fulfilling sequels.
Metal Slug 1 - 3 also made big time sequels. Though I didn't like MS2 as much, it was a huge sequel to the first one and MS3 was an absolutely epic sequel. Metal Slug X was totally unnecessary though.
Two of the best releases of the last year or so are Capcom Classics Collection 1 & 2. And while Sega gave us like 5 Sonic games this past year(that most people hated) and Konami pumps out more Metal Gear Solid and Castlevania rehashes... Capcom was making stuff like Phoenix Wright, Lost Planet, Monster Hunter, Dead Rising and Okami.
Once again, I'm not going to argue with you about companies like Konami whoring up their Metal Gear and Castlevania sequels, but I still feel no company has milked series out as bad as Capcom did. You make a good point, Capcom has made quite a few original games recently, but I bet at least some of those games you mentioned will get milked out eventually

. Heck, Phoenix Wright is already starting to!

I think that SFII CE is way more justified than FF Special. Everyone begged for more SFII while most people didn't know what Fatal Fury was.
True, but FF2 stopped at Special because that's probably all SNK felt would be reasonable to update. If they wanted to add completely new characters or something, may as well save them for real sequels.