Actually when my wife and I were looking around for churches to get married in we asked my home parish first and they asked about $5000 too for the use of the church. It really depends on the area I think and the beauty of the particular church building in question etc. Market forces in other words.
We actually ended up getting married at San Marco in Venice (yes that one) and remarkably that only cost 1,000 euro. It was a miracle really too long a story to tell how we were able to pull that off (we aren’t famous or anything) but it was my wife’s magic really (she’s Italian so that helped too).
Anyway all this is to say it really depends on the church in question I’d say and it’s not “buying” the Sacrament itself, as some might think. It’s paying for using a building it’s nothing more scandalous than that. Shouldn’t get hung up on the price it’s whatever people are willing to pay for use of the church (building).
Salvation is right though, an anullment doesnt bastardize children. It doesn’t say anything about children at all so you weren’t “made a bastard” when your parents got an annulment (jcon40).
I’m sorry to read about all the trials you suffered at the hands of clergy in the Church though. I’ll keep you in prayer. Please try to forgive those involved, it’s really the only way to be set free of such evil.