Personally, I love intros, and I grew up playing pirated C64 games, so I got to spend a lot of time with them. But as much as I enjoy them, when it comes to playing games, I'd rather have a pure dump. If I start a game and it has an interesting looking intro, I'll watch it, then go download a pure patch so that I won't have to watch it in future. I respect the scene and their right to hack in their own intros, and I appreciate the time, money and effort they put into releases. I also appreciate the opportunity to run clean ROMs, and if it takes a little more effort on my part to get them, then I have no problem with that.
Certainly, it's true that I could go out and buy the games if I want to play them as they were intended, but I'll be honest; I don't have the kind of money I'd need to buy some 50+ GBA games. The fact that it's free is what attracted me to piracy in the first place; it allows me to play games I wouldn't have the chance to play otherwise. I do endeavour to purchase the games I enjoy most, but there are too many great games for me to budget for after factoring in rent, utilities, etc. So instead, I play them as they were intended, without breaking the bank.
Liking intros and liking clean ROMs aren't mutually exclusive interests. It is entirely possible to enjoy both.