I can see this going quickly to The Land of Unrealistic Expectations.
Some gooner will be absolutely convinced that they know exactly what the public wants based on nothing but a few likes on a Scenarios post here in the forums. They'll "invest" money they can't afford assuming they'll get it all back because everyone will appreciate their genius. And end up spending the next few months stress-whacking to the custom scene in an effort to "get their money's worth"--or at least get it below $100 a whack.
Then the next Spielberg of Porn will throw a ridiculously specific scenario out there starring the most popular model(s) and requiring an unheard of level of cameraman competence. The studios will come back quoting $20K+ and "Spielberg" will be stupefied.
Then one smart/lucky guy will request some simple hardcore done with a fresh-faced new teen model. That scene will be extremely popular (duh) and will forever be used as the one "winner" example that blinds everyone to the dozens of "losers".
That one guy striking gold will be enough to inspire a ton of wannabe Hugh Hefners to try their hand at the "custom VR investment opportunity". And, of course, the forums will end up spammed with people trying to promote "their porn". "Oh, if you like Nikki Nicole, check this out..." "Here's that doublereverse doggie cowgirl EVERYONE was requesting." "SCENE OF THE YEAR RIGHT HERE!!!!!!"
Then I will push out an AI-written "A Guide to Successful Custom VR Scene Investing" and roll in the money.