Why would any woman want to be Christian?

[EGross]

In the 4th rule concerning this, where a young girl who is not betrothed is caught having relations, it doesn't really matter if she was raped or not. The fact is that the amount of money that would have been due the father has been ruined, and so the erusin cautomatically takes place, and the young girl is forced to be married to a creep for the rest of her life. A Ketubah is not required because he can never divorce her. And so, for making her ruined goods, the girl is punished, and the man gets what he wanted.

The father gets the bride-price whether he gives the daughter to the man or not:

Exodus 22
16 “If a man entices a virgin who is not betrothed, and lies with her, he shall surely pay the bride-price for her to be his wife. 17 If her father utterly refuses to give her to him, he shall pay money according to the bride-price of virgins.

So, money has been taken out of the father's decision, and he is free to decide whther the man is a creep or not.

Yes, the man is being punished for ruining a future sale, and has to pay a price (which, based on the various commandments, will vary, depending if she is a virgin, a widow (who may or may not be a virgin), a divorced woman, or the daughter of a Kohen.) The courts will decide and award the affected party (the father, not the girl), that money.

Given that she is now ruined goods, the father can decide, not the girl, if it is in HIS best interest to give her over to the creep and get the full amount and not have to keep her at home, or take the future-loss amount and find a suitable person who would take her, and there is a financial incentive for the latter, since he already got the money.