It will keep going up in value. Everything Collectable always goes up in value.
    *Long live every pinball machine*

Mmmm sort of true... depends how much you pay initially and how long you are prepared to wait to see its value go up... in the last year, value has gone south NOT north... many games that WERE valued at $X are not reaching those figures... i got OFFERED $5K for one of my woodies some 18 months ago.. i turned it down, smiling... i didnt pay that for it obviously but i was happy at its increase in value.
Id be lucky to get $2000 for it now.

Mermaid sold for just under $20,000 - is that its value?? ONE person paid this... noone has paid it since nor will they.. this machine will not go up in value for a very long time

$10,00 KISS with stickers - price has not been repeated despite attempts to cash in by other owners.

$5000 for a GTB HUMPTY DUMPTY - unless the buyer wants another, this will not be repeated.

The rise in value of machines HAS to be exponential... they level off and stay there for LOOOOONG periods of time.. often dropping