This mod allows you to adjust customer loyalty it also allows you to ban sims from any lot.

To ban a customer/visitor click on the painting & select ban from lot & select the sim you wish to ban.
To allow banned sims to enter your lot click on the painting & select disable ban customers.

Version 1.0a added an option to remove ban tokens from banned sims, als0
the problem with invisible sims being removed should be fixed now.