Normally, I look at 4x food costs for total food price to customer. However, if you give away 25%, then you are looking at 3x food costs. 3x food costs, assuming you are buying at restaurant wholesale is going to return marginal profits to you, and a huge profit to the bar owner. To me, this is a walk away.
I think Bubba is right, and he is a pro, that going with a 25% courtesy fee to the bar owner, who is getting additional draw from you, that is generous. Unless you want to work for free, to build business. Will you get to market and give out your name and materials, sell your catering or party cooking? What would be the upside?
The SS Platypus, sails again, to the support of the Vets!
"perhaps...but then again...maybe not..."