While VI Labs uses UVI Workstation primarily, their Ravenscroft 275 is often licensed for Kontakt. The "Complete" edition, which includes 10 microphone positions recorded simultaneously (Close, Player, Mid, Side, Far) with no phase cancellation, can cost upwards of $500.
To understand the price, you must understand the cost of production:
Found sounds & prepared piano collection
The "Berlin Mains" bundle regularly exceeds $3,000. You can buy a "custom" orchestral template from them for the price of a used car. If you want the "Epic Choir" (Tallinn) or the massive "Metropolis Ark" series, a single bundle can set you back $800.
(~$299 each or $999 bundle)