The tournament my friend hosts in his garage and driveway are most definitely not professional. BYOB and food, no list, no prepay, some guys show up with no shoes and no shirt. Start time is variable based on when people get there. Rebuys are so people don't have their day ended early by an unfortunate hand. Late entries are because everyone runs on Hawaiian time (we get there when we get there). It does have elements of a casino run tournament but much more laid back and loosely organized. He minimizes the effort because he doesn't make anything, just sets up tables and sends out a group text.