Lot's of "expert" advice here!
Cam belt??
E92 bringing more money than an E90 . . . as they get closer to 200,000 than 100,000 miles?
That would be a small fraction of a very fractional value anyway.
The only thing that would give this car any value would be if it had a manual transmission but, as much as everyone hates on the French-made GM Hydramatic transmission, they have been flawless in my wife's BMWs to well-over this mileage. That's been the least of those BMW's problems.
Buy any BMW with this mileage at a throw-away price, in case you have to . . . throw it away! I bought my wife's current E90 328ix with half that mileage just a couple of years ago for less than $6k. That replaced her previous E39 528i for which I paid $500 with 160,000 miles on it, and we enjoyed for nearly eight-years before the electrical system forced me to sideline it. The transmission and engine were still fine.