I think its great. Really if your into Pinball only for flipping and investment, your in it for the wrong reasons. I have owned a TRON Pro modded out for about a year. I got it for $4800 and have about $1500 in mods. I am never selling it. So I really don't care if its only worth $5500 or less. and honestly its such a great game I want everyone to have one!
I think Stern is doing a great job and while the money is coming in they aren't just sitting on it they are putting it back into new games and new cool stuff. I mean you have SM, IM, TRON, AC/DC, ST, MET, TWD, WNBJM and GOT all within the past few years.
I give Stern 2 thumbs up!