I've had people buy me drinks as a bartender.
I've never had a tip (apart from the clean underwear - bus thing) Australians pay our staff and tips are only for good service. New Yorkers please note... We do not consider a sneer good service.
I got a digital camera from Dell for a purchasing decision.
I've held a few million dollar decision making positions but was never offered a bribe for them.
I may have considered it for commercial positions, but for my government jobs?...Hell no! I actually like the jobs. (Just as well... The money was crap, but I think all of us would do the job for free if we were allowed to.)