expirience Selling a bike (beware riders)

[Thunderhead289]

so I just recently built and sold an onyx genesis motorized bicycle and boy the experience I had selling the bike. sold it for 420 and only had 165 in it. but when you put this much effort into something you don't like seeing it destroyed. always thoroughly explain to new riders how to ride and if they don't get it pretty quick, get rid of them or they will destroy your bike.
here is the video of my experience

https://www.youtube.com/watch?v=csQE9V3E-lY

 

[boxcar]

Not quite sure how you managed to build that bike ( nice bike) for $165.
The bike is $141 at wally world. ( no front brakes )
The engine kit is at least $100. ETC....
There has to be some labor....
Tell me your secret............