With the exception of an occasional outlier, BAT prices are fairly close to Hagerty price values which are non-biased and based 100% on actual sales and auction wins not speculation or asking prices. Hagerty currently values a #1 Porsche 356A Roadster at $199,000 down from $220,000 a year ago. It values a #3 condition BMW Isetta at $23,300 and its lowest #4 at $15,300 which is also way down over values from 2 years ago $27,500 and $20,000 respectively.
Hagerty shows an upward trend for the Europa Twin Cam with $41,000 for a #1 (Concours) condition car (similar to what Certified got for his #1) and $28,700 for a #2 (Excellent) condition. Add 10% for Special, 10% for 5 speed, and 10% JPS. Doing the math, the 1974 Special/ 5 Speed that sold last week on BAT ($33,5000) was a #2 car and matches what Hagerty said it was worth. Hagerty values a #3 (Good) conditions car at $17,000 and a #4 (Fair) at $11,200. If you go back and compare BAT Europa sales car by car, you will find most of those number will match. The problem is when sellers try to pass their cars off as one condition higher than they should be: a #3 Good car for a #2 (Excellent) asking-price or an Excellent #2 being marketed as a #1 Concours (better than new). Very few cars are true #1 (Concours).