I think many people are trying to equate the value of a regular 2002 sedan to the lovely CS coupes, which is an unfair comparison. E9 wins everytime. But a relatively stock 2002 Turbo in fairly nice condition, but will require further work to make "perfect" will fetch $50K all day long. A complete restoration of a 2002 Turbo will always be worth quite a bit more than a similar condition E9 coupe. I know this fact is a shock to us, but, this is the reality of the present situation.
This car is not Alvin Tan's restored Turbo, but I think the owner used Tan's car as inspiration. I've seen Alvin's complete nuts and bolts restored Turbo in person a few times, and may very well be one of the best condition 2002 T in the world. While I've not seen the "finished product" of this Turbo in question, I can state that I have seen the progress of the body restoration/paint throughout the last few years while it was being done at UUAC body/paint shop in Burlingame CA. Don't know about the original body condition or how much rust it had, but the finished car body is as flawless as they come. The completed body which consists of many new oem BMW panels is probably better than the one that came off the BMW assembly line back in the 1970's. My estimate for the body/paint work alone is be about $30K.
Much has been made about Alvin's restored CSi, which is really nice, but it was basically a cosmetic body/interior restoration, but not the rotisserie nuts and bolts variety, so it does not compare to his world class 2002 Turbo resto project. I'll have to say the Turbo being discussed on this thread (with the few minor flaws) is on par with Alvin's car. $110K maybe a tad high, but I envision seeing this car being eventually sold in the $85-95K range.
Just my 02 cents.