It really depends on the seller. Some will never take a chance on renters due to the threat of damage, non payment and other ugly stuff.
Most likely the seller needs the procedes from the sale of there currant home to buy the next. So renting is not a good option.
Or maybe the seller is under water and needs out from under there mortgage.
I could keep throwing examples at you but will not. Seller are listed for sale to sell for there own reasons so looking to get one to rent there home would be on a case by case deal.