No, and I've crossed quite a few. Having said that, I have no moral problem with it. I just believe the risks are too great. OTOH if asked to provide a fee from a border guard, I'd oblige, but I'd never offer any coin to speed up or allow the crossing. I guess thats to dividing line for me. If asked,I'd likely fork it over, but I'd never initiate the process. Just too much risk.