I use Dan.com landing pages for a great deal of my portfolio. Many of these domain names, particularly at price points above a few thousand dollars, use the Buy It Now (BIN) + Make Offer + Lease to Own (LTO). I have been running in to a bit of friction with this setup.
The way it is suppose to work is that someone can either buy the domain name immediately for the list price in one payment, buy the domain name in monthly installments of their choosing, or submit an offer to buy the domain name. If a prospect submits an offer and the owner accepts it, the buyer is sent to a payment page to submit payment for the agreed upon amount.