~snip
Sorry, the question wasn't addressed to me, but I just wanted to share my personal opinion here.
Seeing how amazing some slots are, I believe slot developers and site designers are very smart people, and if P2P challenges like you described were potentially bringing more profit to the site, or were making things more interesting for users, they would have implemented that already. I mean, it's very difficult to make them even better.
Maybe the question wasn't directed at you, but that is a damn good answer mate, and there is no denying that. Sure slots and actually pretty much most other games may look like they are not that much of a big on improvement and we may not consider how to find a way to make it better, but these providers know what they are doing.
Maybe it is about the fact that we only have our imagination, whereas they have thousands of mails thrown at them on how to make it better basedo n what people are requesting. But in the end, p2p could be or could not be a great addition, but I know for a fact that if it was loved and requested by many, eventually they will do it.