Hmm.. For me, I've learned that it is not so much the pinflation, since any monetary sales have gone directly back into pinball, which buys whatever it was worth at that time.
My issue is that I have found no two pinballs play exactly alike. So I know that I will never get to experience some of the real gems I have had, despite finding nicer examples which was my thought to move them along at the time :/
All that said, I've had some great titles that have been hit with pinflation.. but no regrets since they helped me accumulate what I have today on a meager budget!
Cheetah
WMS Soccer
Space Odyssey
Strange World
High hand
Card whiz
Cheetah 2
Terminator 3
WMS Grand Prix
Cleopatra
Jokerz
Seven up
Xenon
Flash
Centigrade 37
Gigi
Elektra
San Francisco
Rocket III
ALI Getaway
Interflip Dragon
Star Race
Sinbad
Jumping Jack
Twinky
Rogo
Ali
Big Game
Demo man
Pinbot
El dorado
Close Encounters
Jungle Princess
Strange World
Vector
Volley
Sound Stage
Stars
Rack a Ball
Dracula
Sharkey's Shootout
Super Flite
PinBot
Solar Ride
Beat Time
Sky Lab
EATPM
Combat
Lucky Ace
Black Knight
Flash Gordon
Vector
Spinout