I've personally dealt with selling real estate within the past calendar year. Having someone willing to offer me an option highly likely to close quickly at a small discount to the prospective market rate would have been a pretty attractive option. Otherwise it can take months upon months to close a sale. Months in which I'd really like to have that money and perhaps be thousands of miles away.
Do they think they can make more money than me? I have no doubt. Am I as patient or able to invest as a business much larger than me? Probably not. The real estate market is not always a particularly liquid or quick one to operate in.