Someone closed my question as a duplicate of another question, but mine is more specific. I cannot understand the reasons behind this.
I believe your question was closed because any answer mentioning paid games would need to be duplicated on the existing question about all games. This just creates extra effort and redundancy: why have something in two places when you could have it in just one?
If for some reason you want specifically commercial games, an answer for the question yours was marked as a duplicate of, specifically talks about LinApp - a website that specialises in listing commercial linux applications.
It could also be argued that there are few reasons to want only paid or commercial games - the majority of people will want the best value for money games - of these some will be free, some will require payment.