Poor David gets screwed almost every time
Look at this way: Hilary wins no matter what the couple decides!
She and her cohorts get paid on her scaled down renovation project (she can never deliver the full list) and make money no matter the outcome.
David, on the other hand, can only make a commission if they list their home. He can spend hundreds of hours poring over listings, making phone calls, and driving them all over hell's acres, and then they decide to "love it", at least 7 times out of 10.
Hilary has the advantage (if this is really a contest which it isn't) in two crucial areas:
1) It is always easier to stay put than to move.
2) Hilary always uses a major chunk of the reno budget for staging.
She takes a normally unkempt, cluttered home, removes the clutter and beautifully stages the reno areas and presto-bango! the couple is immediately captivated by a living space that will soon resemble their former unkempt cluttered style of living.
Poor David gets screwed.