Point One:
Animation is much easier to do with 3D models then with 2D animations. Models you can just move. It's a bit more intensive to make it into an animation, but not a lot harder. A 2D work needs multiple "frames" or complete images to make an animation. This is very labor intensive. Especially if you want the animation to be fluid. Fluidity requires a greater number of frames. It also requires more things in motion per-frame. It's easier but less satisfying if it's just a penis going in an out, versus the whole body moving and responding to what's happening.
Point Two:
As I understand it, Milky Touch is not profitable. If you look on the studio's page, it specifically has a goal at the 2,500 mark saying that:
"When we reach this goal, the survival of the team is guaranteed and we will not be shut down in August, and we will keep delivering amazing creations in the future!"
AKA: The animations you showed almost certainly do not cost less then a 1000 dollars a month. That shit is expensive, and if you asked the dev for Milky Touch he'd tell you the same thing.
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