@Jay Hinrichs sometimes eliminating commissions and closing costs on a cash sale can make the deal more appealing to a seller. This can easily be a $8000 swing. Not all sellers know the market. Personally as an agent and a wholesaler, I pitch both sides to a seller and let them decide. If I think the benefits of listing the home on the market truly outweigh an off-market sale, then I tell the seller. I try to suggest what is best for them and their situation. Some sellers only trust the agent or wholesaler they are working with and don't want strangers in their home unattended even if that means they are with other agents.
I fully agree that often selling off-market is not the best thing for the seller. But many houses will not pass inspections or qualify for a loan due to condition, and many sellers do not have the cash to make the repairs.
Also when selling off-market, there is less of a chance that the contract will fall through. Most wholesalers who run their numbers correctly can find an end buyer before their contingencies expire.
Every seller has a unique situation, and it is our job to figure out what works best for them.