I've been involved in them before. Some go smoothly, others will make you wish you never had this idea
Here are some things to think about before you decide to do this:
Consider limiting the number of people. (fewer the better)
How will everyone be paying? (paypal is best) - get payment before you order, if they dont have the fish/coral/invert they want when you order you can always refund them.
Who receives order?
-coordinating a group pickup at your house can be daunting, we all have different schedules. Make sure people know approx where you live before placing their order.
how are you caring for the fish until they are picked up?
How are you handling returns and credits (liveaquaria - 14 day alive guarantee)
All this to save the $30 shipping cost
David