Oh, sure. That I can see. Premium minis. Say the basic red dragon is the 3d model, maybe with a couple of animations. But the next step up model has a bunch more details, nicer colors, and maybe a few more animations. Then the top tier model is the really gorgeous model that makes your graphics card whine.
I mean, heck, I actually expect that sort of thing. If WotC doesn't offer it, but allows 3rd party artists to produce stuff for the VTT like other VTT's do, I would flat out be utterly shocked if we didn't get something like that.
Same goes for maps and tiles. Again, this is just standard VTT stuff. I can use the basic stuff that comes with Fantasy Grounds, or I can get on a Patreon or two and have freaking gorgeous maps. Again, this is all pretty basic stuff that's offered by every VTT out there.
But unless Rotfeutanixn is some sort of lore dragon that I've just missed, who cares? The minis in a VTT are not really that big of a deal. People don't sit down to a game of D&D on a VTT to ooh and ahh over minis that are going to be on the table for all of twenty minutes in the third session of a 60 session campaign. The point of a VTT is to play D&D. (Or whatever RPG you're going to be playing) I'm sure there are some people out there that will pay premium prices to get that super special mini. But, the vast majority won't care. It's not like a skin for Fortnight where you get to show off to all sorts of people that you have that special skin.
Minis in RPG's don't fill the same role.
(The following dramatization is based on an assumption that a large corporation wants to make more money.)
Don't underestimate the power of FOMO.
A team could also mix it with a little bit of guilt, crib some notes from televangelists, and
BOOM Sales!
"Hey, everybody! This Faux Jangles, and I'm here to thank this month's list of special gold members. They have elevated their games to the next level..." "...and now, they're not only saving Faerun, but the baby turtles in the real world. You can be hero too; all you have to do is upgrade to gold, and we will donate a portion* of your subscription fee to the Imaginary Turtle Friend Network." *1% of net proceeds.
Depending upon the audience, a team could potentially leverage a combination of social issues & shame to sell something.
"Want to prove that you are a good
ally to have in a party? Equip your next character with the new Rainbow Bolt cantrip."
(Note: I am not in any way against supporting marginalized people. I'm highlighting sales tactics common among contemporary companies -especially in America- that are used to push product at certain times of the year.)
Veterans Day: The limited edition 5-Finger-Death-Punch strike for your monk, for the character that was born with a shotgun I'm their hand. Want some boomstick for the other classes in your game? Buy the premium digital-foil pack.
Maybe each of those things is also just slightly mechanically better than the basic options.
For an extra level of obfuscation, don't directly charge for money. Instead of the special options being $20 (or whatever price,) they cost 100 Dungeon Bucks.
To get the Dungeon Bucks, you pay something, but the end result is that the "prices" listed on the content (or randomized packs or whatever) are not associated with real dollar amounts. So, mentally, the customer is gaslit into spending money without thinking of it as spending money.
As far as the dragons, I made those two names up. But a marketing team could attach special significance to them.