"Hit and run" posters / trolls
I've noticed we had a lot of new people here lately, posting very basic questions, usually "help me buy a bike" or "help me lose weight by cycling" type things.
There's no way of telling if they were genuine and satisfied by the responses, but generally if someone does not come back after a post or two, "hit and run" can be suspected.
Too bad for any genuines, I don't think I'll freely give out advice to a first time poster anymore. Potential waste of time and pixels.