Buyers are often shameless when demanding bribes from suppliers.
A long time ago, the company I worked for had a potential customer in. He "wanted training" so that he could commission a machine on his own.
He spent the entire day dropping exceptionally unsubtle hints that he wanted us to get him a hooker. This was quite a big deal, so it actually would have been cost-effective - particularly as we'd be able to charge for the commissioning of any machines he'd buy, as he was singularly incapable of doing the job.
My boss - one of the directors of the company - was a lay preacher, and was very serious about his faith. We didn't get that sale...
Vic.