You need to factor in interest paid on your bay area loan to get the full picture. Just because your house value goes up by a certain margin does not come close to meaning you have profited by that much. This is especially important to understand in areas with large home prices in that the cost of holding the asset (interest) is very high especially early into the loan.
If you live in the bay area, you may be short the "house value" equivalent of $500k, but living in Illinois you may be short the "house value" equivalent of $250k. Of course the location is part of the "minimally viable" part for certain people, but for others this is a less important part of "viability". Regardless, it's not a dollar value, it's "house living value", and anything beyond that part of the equity in the house you own (for most people: the majority of it) is speculation/investment into the real estate market.