I do one weekly in and out, there not national and from chatting with the main man there they never will be.
The particular store I clean do a lot of charity events etc and also like to support local businesses. Iv found them a great company to deal with, always pay on the day, always pleasant to talk to and they let me eat for free anytime I want! I don't like to take the p@ss though so have only had the free meal maybe 3-4 times in 2 years.
Almost every week though they tell me to bring the family in for a meal, on the house. They must be doing well...