"shaving becomes very difficult" ? er it takes 5 minutes, for me every second day. Most retired guys have got all the time in the world. Too hot here anyway to have a beard. Maybe can understand in a cold climate.
I have steered clear of buying second hand bikes. Too many dodgy dealers, ex rental, auction repos etc. For the prices you quote 60-70,000 better to pay a bit more and buy new.
There must thousands of Russians working here illegally to fund their stay. I often wonder how do these many young couples (with children) i see afford to stay in Thailand with no job.