Basically you need to charge enough to make it worth your time and energy. Everyone in town could be $10 and you could charge $15 and it still not be worth your time and energy.
What are you worth per day?
The reason I ask that is because while you may feed 25 folks or 125 folks it still takes a day of your time. This is where the restaurants have the advantage, they are gonna be cooking regardless, therefore you are not competing with them. If you are beating their pricing you need to walk in front of a speeding truck because you are killing yourself anyway.
I keep seeing folks asking about pricing on this site. Unless you need to do a catering job to keep your car or keep the heat turned on it's not about pricing, it's about marketing. We really can not set your price because we do not know what your overhead is gonna cost. The biggest mistake I see most folks making is they fail to put in the cost of wear and tear on their pit and other equipment.
I use a vacuum sealer and have samples I give out and if I get the business fine, if not that is fine too.... most folks do not do this so you will be surprised at how many jobs you will get.
I price differently than most folks on this site. I go for $1k profit every job, heck I already know that the day is going to be consumed. what is another $100 in food. I can buy 10 pork butts for $70 or 15 racks of ribs for the same $70. Also remember that it's always more than a one day job unless you have a warehouse of food in your pantry. Build a spread sheet and shop with it. I have three/four stores I shop at, SAMS or COSTCO, wallyworld and Restaurant Depot. I actually don't shop any more I buy, I did my shopping a long time ago.
Also remember that if you are the low bidder and you do this part time, then you are just stealing from the businesses that do this for a living. It drives the whole industry down too. Charge what it is worth.... If you do a job on the cheap in hopes of getting additional jobs at a profit.... there is a saying "You are only a good as your last low bid!"
As always my $.02..... :icon_shy