As with most things, "free market" is what they demand when they don't get have access to the market or can't command the whole market.
Once they have access or enough of a percentage to set the prices, suddenly the best thing is high barriers to entry and whatever else will help them maintain inelastic demand.
Abortions are fine as long as you force them into the prison system as slave labor first.
You just can't abort fetuses before they've had a chance to make money from them.