Paying the buyers closing costs?

[Wesley Frye]

Is it common for a house flipper to pay a buyer's closing costs? I have just listed my 1st flip for $220k and got an offer for the asking, but the buyer wants $8k for their closing costs. I was unwilling to pay the $8k and agreed to $4k. The buyer's lender now says that the buyer needs $8k to close and upped their offer to $222k vs the original offer of $220k. The house has been on the MLS for 10 days, and I am now questioning whether I should accept this offer. I want to entertain more offers because of the $6k in closing assistance, but I want to get out of this house and get on to the next.