as far as what the business has to gain from it? The ammy shows here in Oregon still pull decent sized crowds The fcff hasmost of its shows at the Roseland theater (capacity of about 1400 people) For a smaller business that can be a great exposure to a dedicated group of fans.
Another thing the OP might want to look into si finding a promoter that gives you ticket incentives. There was a fight promotion that did mostly ammy fights here in Oregon (Capital City Cage Fights) and James (the Promoter) would let his ammy fighters fighters sell the tickets to his shows.the ticket price was $25 General and $50 for ring side, he would let the fighters keep $10 for gen and 20 for ringside ticket sales.
The athletic commission was fine with this and it does not affect the fighters Ammy status because you are not getting payed to fight you are essentially getting paid to as sales person. So check with the different orgs in your area and see if any of them offer any type of incentive program like this. If not suggest it to the promoter (it is a great way to build hype and fill seats, which will help the org grow and move to bigger better venues)
If you do get to sell tix then sell them every where you go not just friends and family take them to work the grocery store throw **** up on FB every thing the more hype you can sell and the more asses you can put in seats the better it will be for you and the promoter.