Car = $10k
Raby motor = $20k (or more. I don't care enough to check and I will never buy anything from or by him)
Total invested in car = $30k
Cars final value with super special Raby motor = still $10k
Basic math states that Raby rebuilds are a baaaaaaad investment.
I don't care what magical fairy spells he knows; only an idiot would invest that much money in a $10k car.
Someone needs to tell that guy that these aren't $50k cars anymore. Apparently, he didn't get the memo.