Look at the state of the comments because I missed a letter
I'm going to focus on something totally factual here. That missing letter is one of, if not the most important, error picked up on your ad. I joined this forum as I was looking for help and assistance with finding my first Z4.
I very nearly made a mistake by buying an "i" rather than an "Si" I had no idea there was the best part of 50 hp between the models. I would have been more than upset if forum menbers hadn't pointed this out (multiple members did) and I had proceeded with the purchase. I had no idea at that point there were 2 2.5 variants.
I am mentioned (not by name) elsewhere in this thread as a seller. I tired my hardest to describe the car as to how it was so the buyer was completely aware of everything, including any flaws. Not describe it as one thing initially and detail as another. I personally think that the use of the word "immaculate" is very dangerous for the seller as in 99.9% of cases it isn't. It may be VERY clean or excellent for it's age but immaculate..............
IMO that's one of the great things about this forum. The intervention, and interaction, of members to help less knowledgeable people make the right choices and have the maximum information at hand about a possible purchase.
One of the most regular things on here is new members asking for purchasing advice. A regular and numerous reply is "link any prospective purchase on your thread and you will get opinions and steers" I did this many times when looking for my first Zed. I also ended up not buying any of them as people knew all the things I was missing through MY lack of knowledge.
I ended up increasing my budget and buying a forum members car. My view of that was I bought from a longstanding and known forum member. That's part of what I feel this forum is about. There is a trust and protection of members longstanding and new.
IMO this is why when somone joins just to sell, that "protection" will include comments on an ad that will help either other members or people looking to make a potental purchase.