I cancelled recently. No major reason. I just wasn't feeling it.
I owned an original, unrestored very nice MM for 9 years and sold it because I just didn't play it much anymore and have limited room. I got caught up in a bit of the hype around the Expo announcement, but I sobered up and realized the reason I sold my MM is the same reason I'm not paying $8k for another one. I just got tired of it and am enjoying playing other machines more.
With the 1000 LE's and the who knows how many standards, there should be no shortage of MM's out there to purchase should I change my mind in the future.