Boris3 said:
I've seen the car in paddock and on track. This is a good deal for a GTS2 prepped car with all the parts included.
General advice is buy your first and build your second. It gets you racing quicker and by that time you have a better sense if you're going to be all in and in what series.
Doesn't always work that way and some folks build their first and some get stuck mid project. Life intrudes and projects get sold.
Building to SCCA or NASA class versus building for chump, lemons etc also have different demands and price points. For those looking to buy a built car for NASA a well prepped clean SE30 runs in the $10-14k range. A car with GTS2 level prep like this swapped one or built on an e36m3 chassis moves you up the price brackets. Mid-$20k and higher...
So yes pretty wild what folks might shell out for a built race car. Hits you all at once in this case versus the frog in slowly boiling water build your own experience. Either way you're still smiling as you get "cooked"... 
What is this racing thing you speak of? I understand the working on the car and never finishing thing quite well.