well, partly fair, partly not: Charging more for fixing homes and for a revived neighborhood is ok. Charging out of the world prices for properties that have a much lower fair value is for the dumb or impatient. I think one of the worst misnomers is the statement that "it is worth what the market pays". Same in trading. Yes it is absolutely correct at the very point the transaction occurs. But not true at all a day or month or year after. In the long-term market prices revert to fair value. Equating fair value with transacted prices could not be more wrong.
Paying 755k for a shitty dog shack in Oakland, one of the worst places on earth to live, is highway robbery no matter how you turn it. Its far removed from fair value. And it is a clear indication of an overpriced market. Only dumb people pay inflated prices regardless of whether they think prices go up further or not.