Surely that'd be an insultingly small amount to receive as cash? (Maybe that was your point? 'And then realise it doesn't show that much gratitude after all'?)

I worked in the hardware lab for a while, and we had the incredulity to ask why they didn't do just this. Turns out, our director told us "it set a bad precedent, and if they did this with us other teams might be encourage to do this as well." As you might have guessed, the hardware lab was not the most social and 1/2 of us didn't drink, so bars were out.