Not really Ray,
I see bikes with green book goes way higher in sales price than bike with invoice or no invoice.
I can get a 3% taxed bike much cheaper than an equal green book bike, if no tax they are even cheaper as people don't want to have the hassle of getting the bike confiscated, OR as the invoice bikes, a ticket for riding without registration when you go out.
the price list from the Police is this
Riding without a plate = 400 baht
Riding without green book = 400 baht
Riding with overdue taxes = 400 baht
That is 1200 baht fine without green book in reality even though you have paid the 3%, you still have no legal reg, hence no green book, hence no road tax paid.
Also if you have no insurance it adds up another 600 baht.
Conversely if they think your bike will NOT pass the requirements, it's another 1000 baht fine. Should you NOT have a National plus International license OR Thai license it's another 400, and should you miss a part on the bike, say required fender it adds another 1000 baht.
So WCS could be up to 4200 baht fine, and YES they do give multiple fines now...