Is it certain people are using GPU or do they just have access to a lot of fast PCs? I don't know enough about the algorithm or GPU computing to judge what is possible. I have tried mining on my PC, but it's not especially fast and won't be on 24/7, so I don't really expect to get anything. Just wanted to to try it.

I just hope it doesn't turn out like Bitcoin where you need massive investment to get anything.