VC gives you no control over how the game is emulated. 9 times out of 10, the game is going to look and sound like it was originally released.
That's fine for most people, but how about people like me, who run with AA in the highest resolution with sound at the highest sample rate?
Not to mention I can have any game I want. It's not the matter of "I don't want to pay for the games", quite the contrary, I would pay a reasonable price for my games. However, Nintendo is slow at releasing games, and third-party games are hardly ever released.
Also, I mainly play single player, if I play multiplayer, it's netplay. So a monitor is just fine for me.
I'll probably get a laptop down the road, but as of now my PC is just fine for playing emulated games.