Because Palestinians don't want to BUY them! They want them to be GIVEN to them and then other Palestinians will say, "Well, you gave them houses so you're obligated to give us houses." Then, Israel gets to build housing projects for any and all Palestinians who follow up on their "right of return".
Cash up front or demolition. There should be no in between. Arabs are the biggest consumers on the planet and the smallest producers. If not for a couple of countries with oil they wouldn't even be able to finance their murder campaigns. Time for them to start paying for what they take for once.
Interestingly there have been a couple of threads indicating the palestinians don't want them. If stable, productive communities were the objective, they wouldn't be expelling the Jews. There's room in Gaza for 8,000 Jews. And if they're "sold" to the palestinians, the US will be paying for them.