Seems like a lot guys on here don't even own a boat and/or think they are qualified to give out financial advice to those who do. Boat owners on BD range from 2k boats to million + dollar boats.It seems like a lot of guys on here invite strangers on their boat, because they can’t afford to run them by themselves. If need to invite people on your boat to offset the price of the trip, you need to think about selling your boat.
If you are lucky enough that someone will take you along for your "fair" share of the trip cost; they are being more than generous. If taking out a few fishing friends a few times a month helps the owner afford additional trips what's the problem? I don't know anyone that buys a boat with the intent of only being able to afford it by getting others to chip in.
For shits and giggles I looked up what a full day cattle boat with 39 close friends charges , $200 seems to be going rate. Add food/drink, fish cleaning and tips and it's about 3 bills. If 3-5 guys were sharing expenses on a big sportfisher they'd probably save a buck or two.