I dislike calcuttas. The good thing is supposed to be that they bring in outside money. That is also the bad thing. Often gamblers that don't even play pool come in and take the cream off of the top of the calcutta. The return on investment varies from OK to very good but the risk is very low if you have purchased the top players. These guys have ran the price up on top players where perhaps the entry fee was $1000 but the player will have to come up with over three thousand to buy half of themselves back. The rules don't always specify the player has the option to buy half of themselves back in which case it is entirely up to the calcutta buyer and sometimes they won't sell.
OK, often not practical or possible for top players to buy themselves back, at least the calcutta holders will toss 10% jelly. Not nearly as likely for these outside gamblers. Calcuttas are typically Dolly Parton payouts, all on top or most on top.
The gambler made a nice score on one player, broke even on one, and lost his investment on one. So before he gives anything to the player he has to calculate what he really won and it may be a lot less than the calcutta paid to win. Also since this is a professional or very serious gambler, he may consider where he is at on track wins and losses, football, his big picture. He may be in the hole even after winning the calcutta at the pool tournament and not be inclined to toss jelly while he is still in the hole overall.
Another bitch about the calcutta, it often starts at a set time with the tournament starting immediately afterwards. The auctioneer sees it as his job to get money in the calcutta and it may take ten minutes or more to auction off a popular player. The calcutta may run half a day! Another auctioneer, it might be over in two hours. So I very much dislike it if the calcutta makes the start time of the tournament uncertain.
Player's sidepots I like. In theory only players involved, it is optional, and all players pay the same so it might add a minute or two to the sign in at most.
Hu