In order for this to happen:

Women would have to be really ignorant as to whether they were pregnant.

They’d have to actually want the abortion.

They’d have to be able to pay for it, meaning they couldn’t be dirt-broke or under eighteen. If they were under eighteen, their parents might get involved and that’d quickly expose a practice like that.

The nurses and staff would probably have to be in on it too. Not impossible, but improbable.

Etc.

Seems really unlikely to happen with any frequency. It’s a terrible risk to run for a relatively small amount of money.