Well then Blackrock would only make $500/month in profit. This is good, you found an actor willing to pay higher taxes for the same land and thus contribute more to the public purse.
The issue is that the value for all land in all cases trends towards zero. If you start making a profit you have to give the government all or most of it, if you lose money you just abandon the plot since the debt isn't attached to you. There's zero reason to ever do anything.
