Who Pays Realtor Fees?

[Tiffany S.]

I was signing some paper work and I noticed a clause that basically stated that if the broker does not collect a 3% fee from the "seller" then the buyer is responsible for paying the difference up to 3%....

I've just never seen this before...i've only worked with a hand full of realtors though.

1) I thought that seller pays realtor fees normally...is this not the case for REOs/Foreclosures?

2) Is this a typical clause in most broker/buyer agreements?