I always seem to get 600, 100 of which are kids. The other 500 are really 275 because they're couples, and half of them are half in the bag by the time the food is served, and don't think (or care to) ask who did the food. In the LA area, there are just so many choices.
After years of sales/marketing, a 2-3% referral rate seems reasonable. 2% of 600 = 12. I'd be satisfied to get them over a 6 to 9 month time period and charge at a good margin for me. My $.02
Just me, the Wife, and the Dogs