Mad_Cyril I admit I don’t know a huge amount about how they pay, but as they are outright purchases I figured they can’t be that bad, but I could be wrong.
As for recommendations, I agree about algorithms, but I think Beatport does a good job of filling the page space with lots of options such as charts, and what other purchasers also bought etc. I don’t feel like I have to go too far for similar inspiration.