If someone could make a Mezco One:12 figure for cheaper, they would have already done so.
No company produced something as good for less until 2020 or so, and most of these were Chinese wannabes so labor is a whole lot less and they don't even have to pay for licenses. And despite operation/overhead costs being 2-5x less, they are charging only $10-20 less than a One:12 figure (usually with shittier QC too).
So it points toward Mezco-tier 1:12 dolls actually being that expensive to produce.
I've already posted 3 examples of low tier and mid-tier clothed dolls are many steps below the quality you see on higher end 1:!2 dolls
Pic is an example of how a company produced a $30 figure with the same features as "high end" Japanese collector toys. Just one of many examples of companies wanting to get a larger piece of the pie witthout charging an arm and a leg.