I think it's a brilliant entry point to the forum - you should definately go buy it, then come here to run through all the issues etc & get it sorted.
It has just about every red flag you could want on an e89. 100k miles - check. No mention of service history - check. Dents & scratches all over it - check. Missing the nice options - check. Lots of short term owners - check. Marmite colourway - check.
Like I said, it's cheap. For lots of reasons though! So long as you can afford to keep having it in the garage for the next fix every couple of months, I just cannot see this being a good & reliable vehicle.
I haven't ever done well with 'cheap' cars like this TBH. They have all ended up costing me a fortune to get into even 'just ok' state. In the good old days we used to call cars of this age, in this unloved state 'Money Pits'.
If you have your own youtube channel, get free parts, own a garage & a bodyshop, you could probably do well with this.
I get that you like it - come prove all us old cynical people wrong!