hahah.. been there, done that
my 1st bike i bought at groupon. that time no shopee or lazada for rm300.00, later i sold it and get mongoose 24speed. that time, i feel wanna try 1st and dont want to waste my money.
bought another dahon vybe d7 (cheapest model from dahon - that time rm1k) for my wife.
after bought dahon,.then i realised that the bike is solid, feel stable and good ridden. all the groupset/gearing can change without any impact on handling feel. that time i scout for tern and sold my mongoose.
and the rest, history began lah..hahaha
what u can see is, buy and sell will never end. and i got some amount of loss when doing it. then i realised, why i didnt buy tern at 1st place?

anyway, i do satisfy however that my loss changing bike i can gain many expirienced on it
oh ya, i do modified all of my bike. nothing in stock condition