I ran a pool of 10 people for about 6 months in Lotto 6/49 in Canada.
I set up rules of participation and made them all sign them, then collected
$32 to $36 per head every month. We played 40 tickets per draw 8 to 9
times a month. I made the playing very transparent providing everybody
with a copy of all tickets. For about 4 month we were in black (won more
than spent) but then our luck turned and after 2 month of losses the pool
dissolved. Never had any problems with any participant.
I like pooling because, despite what many people think, it does increase
chances of winning and spreads the risk.