I'd sure charge more than $20. You got to figure that even buying bulk you are going to pay 8.00 lb. for crab legs of the King Variety. You can probably get boneless ribeyes for $5.50 per lb. (Choice). So you are talking a leg (king) of let's just say 1/2 lb. $4, plus a sixteen ounce steak = $9.50 x 3 (too make profit) = $28.50 per. With side dishes, bread and incidentals increase $4.00.
Feel free to look at my website, It is priced out using the 33% rule.
My math dictates 33% food and supplies; 33% labor and 33% profit. Yes, it fluctuates north and south, but that is my target.
Peace and Smoke,
My Weapons: Custom rig - Kandi, UDS; Bubba Keg; 22.5 WSM x 2; 18.5 WSM; BWS extended party; BWS Gator and an Onyx Oven; 29' ft Coachmen Leprechaun (Lola).
Dan Chambers get well soon, so we can tell you to "Shut up Chambers"