This seems to be a good resource for architectural conceptuals, but the prices are a tad much it seems. I guess a company can certainly justify the cost and if that's their target, they are probably dead on. As a hobbiest, I can't see much value in it for me. I'm most likely not their target customer though.
Prices in the Design Asset store are set by the designers themselves, however Strata expects new design assets to be added to the store daily. So, hopefully with more designs available you will be able to find lower prices. Thank you for your feedback!