I'm not sure why, I've just never liked Gimp. Photoshop seems more professional, as said before... Gimp has just annoyed me in the past and I've never cared to give it another chance.
Photoshop may lead some times in some features. But as far as the hardware requirements is tabulated against the features available surely gimp will be the leader.
I think that with the massive availability of torrents illegally distributing copyrighted material, including Adobe Photoshop, the price tag doesn't really have that large of an impact anymore
Last year, my American Studies teacher forced us to use GIMP to create maps for projects. Actually, it was GIMPshop, some remake of GIMP that had tons of problems. Overall, very few people took her recommendation, and most people just used Photoshop or Paint.NET.I personally think that it all comes down to what you need it for. If you're a hobbyist or just a casual user, the Gimp is right for you. But if you need something for let's say a job, or something professional, Photoshop is what you are looking for.