There are plenty of bonused shops in Santa Barbara.
Reasons:
High cost of living
Low population
Not easy to access (101 N or S). You can't easily access it from the east, and the west is the ocean.
Most well-to-do people can't be bothered to do a $10-$20 shop. They also aren't going to spend 60-90 minutes in the fancy grocery store, asking questions in every department for $35-$50.
I think that shoppers from Santa Maria, Oxnard, and Ventura probably pick up a route of shops when it is profitable and knock out 10-20 in a day.
P.S. most real shoppers hate gigspot, so eventually, you will disable it. For now, it will help you find some companies.