I count all my real estate because:
1) 90% or more of my NW is in RE, my house is just part of that. I'm actually less inclined to count my meager stock holdings, since, well, they're meager.
2) Mint tallies it for me using Zillow zestimates. (wrong, yes, but there's no effort involved to get those ballpark figures ).
3) High numbers are funner. My house is tippy toeing towards 1M, and it's nearly paid off. So, yeah, it counts. I could sell it and buy 6-10 doors/little houses in a LCOL area.
I'm one of the outliers here in that my NW is mostly RE, my income is mostly RE, and the stocks just sit there bouncing around. Even my good returns in the stock market pale in comparison to my good returns on RE. That's what I do, that's what I know, so I count it all. I can see the point of just eliminating the personal residence in a net worth tally when your assets are elsewhere, but, at the end of the day, the real definition of net worth is-- what all your stuff would be worth if you sold it? If you died today, what's the estate worth? That includes your house, cars, and grandma's wedding ring. Except we, alive and well and on MMM, don't want to sell it, we want to figure out how to help us live. So, while you're living, you probably just want to count the assets that support your expenses/liquidable/income earning/ etc. Semantically speaking, it's a different tally, but perfectly acceptable to include your house and stuff or not. Earlier on my path to FI, I used to include pretty much everything, but now just the really big stuff. Basically, now, for me, that's just the real estate, with a nod to the stocks.