I’ve been quite massively undercharging then… I quote for time, how long it takes to create rather than set fees. And models are anywhere from $15 to $1500 so far ($1500 was for almost 2 weeks).
The assets are there if you think they are overpriced then do not pay for them, if the sellers are not getting enough money they will drop the prices. Personally I am waiting a good 6 months before I buy anything as having something look exactly like everyone else is buying right now would make my game not as unique as I want it to be.