Lol.. I did, 3 months ago.. 2 months ago.. a month ago.. Several of us did, the folks who didn't preorder, and some folks recently who cancelled. BTC at $1k/USD with a conservative difficulty, Neptunes would never ROI (regain the BTC spent), unless they were delivered by March-April. May pushed you into "youd get most of your BTC back but not all". Beyond that it was just dead weight.
Don't worry about the difficulty, it levelled off 4 months ago. If Bitcoinorama was still around, he'd tell you the same thing:
Dude the hashrate is about to level out for a bit not, continue growing like this for a while.