the two room thing, that's kind of a neat trick.
If you look at project melody, I think they started off with vrchat, and a custom model.
They probably spent like 1.5-2 k on a gaming PC. And 1,138.97 on a vive and trackers. And I think they got the original model for a couple hundred. (not counting the later billing issue)
But if you compare it to CodeMiko...
She's running pro mocap with xsense and probably spent upwards of 13,000 on just the mocap, 1.5-2+ k on a pc, another 2k on face mocap, and on going licensing fees. Another 2k a year on maya, another 1k on adobe cloud. And she didn't really need to pay some one to make her avatar, but there probably lots of hours put into that, and unreal.