[rticesterp]

I had a similar experience with the Best Buy Geek Squad. They went above and beyond and I tried to tip $20. The geek squad guy waved his hands, backed up and say "No I can't take that". He said the only thanks he wanted was filling out the survey and my repeat business.

[SAI_Peregrinus]

Company policy is probably that they're not allowed to take tips. So accepting it would be a risk. Getting you to fill out the survey and give them good ratings could get them promoted instead of punished.