I own multiple legit soom fullsets and I've never paid $600 for them. It's called buying second hand and being thrifty.
Your logic falls apart when it's used on bjd because bjd are art. The people producing recasts aren't makeing an affordable comparable product, they're making a straight up counterfeit.
There are plenty of sub $300 bjd out there and tge sheer amount of companies to choose from means there's no excuse for buying a knockoff other than you want a doll you can't afford so you'll steal it.
By your logic someone who wants a Ferrari should steal one instead of buying a car they like less that's in their budget. It's total bullshit and you fucking know it.
Recasts cost less because the maker doesn't do any of the work developing it. They just swoop in and steal a finished product.
My question to you is what would happen if all the people actually fucking designing these "overpriced" dolls stopped doing so?
You wouldn't have your recasts without the originals to steal. They aren't not a legitimate competitive part of the market the way cheaper legit bud companies are. They're parasites that cannot exists without the original.