Yeh, if they are expensive Leica's sell them immediately.
No matter the brand, you still wind up paying out the ass in lenses. I love portrait. I have a Nikon D850 with what I consider a complete and perfect collection of portrait lenses. That is 10 lenses. If I loved sports, I'd probably only have 4 lenses, but each lens would cost 2.5x as much... so still out the ass.
If you're young and can wait long enough, these digital MF cameras are starting to make ground. The latest sub $10,000 models don't yet hit official MF sizes, but it looks like in 1 or 2 more generations they will finally be in the low MF range. That said, if you had $10k, the Fuji GFX 100 looks like the ultimate mirrorless "SLR" (for portrait at least).
It's always a serious decision, because once you're in that camp, you're buying those lenses.