Advice for newcomers to the hobby

I see it with vintage motorcycles all the time .These 20 year old kids buy a bike ,lets say a late 80's BMW K100 for example.They pay 2000 to 3000 for it and the bike is nice., a running machine that a few hundred bucks would get back in service .They strip it and sell off all the parts they don't want to use in building their " Bobber" and then lose interest when they discover that fabrication is a skill they do not have and everything they want costs hundreds of dollars. I bought all the fairings for said bike for my K100 last January .I saw the bike he bought on craigslist some months before for 3000 .It was a real nice bike with 30,000 miles on it ( these go 200,000 + between rebuilds) I paid him 300 for all the body work.Last week I saw it on craigslist as a work in progress , non running ,no seat,no handle bars,painted wheels best offer . Basically he destroyed a perfectly good motorcycle