It all depends, I just built an av10 euro that can probably reach 60mph pretty dam easy for about $700 w/the bike. I already made $300 back off parts and still have two rolling maxis I got with the purchase and an entire box full of motobecane , and puch parts.
I’ll probably almost make all my money back and still have the bike to keep enjoy and sell later in life for good profit :)
I got a complete puch sport maxi with snowflakes that I’m being payed to ride around. I got two maxis for $200 and a bunch of parts and a spare za50. I sold the za and some parts & made $300 lol.
Mopeds the only motor sport I’ll ever make money @