The thing is, if people are going to pay those prices, then at the moment, that's what they are worth.
I can't however figure out how they have reached such levels, especially as few are rare (compared to many, even chewie is not that rare) and Palitoy, as Lee said, has always been popular. In addition, there are now far more known to exist than when I started collecting them, back in 2001.
It is right across the board though, not just 12/20 backs, but 30, 41 45a. AFA'd or not.
I hardly know any Palitoy collectors now compared to the numbers I knew years ago, but logically it can only be a massive increase in popularity that's driving up prices.
Or one or two idiots are paying stupid money...I've seen that have an effect in the past.