Tastings are freebies. Part of trying to get the job!
I know that, what I am saying is that for a price range of $12-$16 pp for catering 50 -75 people there is not a lot of profit in there to spend an additional 12-14 hours cooking BBQ for a tasting to try and get the job.
Now if you are talking 300 people for a wedding at $20-$25 pp I can see your point in cooking them a tasting session to get the job.