As a Wal owner, I have not even the slightest objection to their value going up and up. Quite the opposite in fact.
Why do you find it 'objectionable' anyway? You obviously don't want another Wal so why should it particularly bother you? Do you object to the value of vintage Fenders etc too? Genuinely curious to know.
Presumably you haven't seen the price of bolt on neck, solid wood Foderas recently..?