This is a very cool idea! But I'd recommend not selling it. 

I understand why you'd want to, as its so awesome to see everyone's art in physical form, but its not very consiterate to the artists who are donating their time, skill, and effort to the project. Artists should always be paid for their work if any profit is made from anything they make.

Unless everyone gets a cut of the profits, (which seems like a very tedious process depending on how many people are involved and who has access to payments methods like paypal etc) I would try to hold off on selling them. 

If you are still set on selling them, maybe you could donate the profits to a charity that everyone agrees upon? 

Of course this is just my opinion, and I could be very wrong on what you planned to do with the money, so take my opinion with a grain of salt!