keeping my preorders....
..... I want to make money
does not compute unless you used someone elses money for those preorders
At today's speculation by some about the future rise in the difficulty, no it doesn't. Take the difficulty rise in the past, the present rate, and calculate the percent increases and project that over successive two week periods to the end of the year, then take into account how many TH/s the miners will do and yes, it's still projected to be profitable to the end of the year.
I don't work on emotional speculation. I work with hard numbers. Those hard numbers tell me it's not time to dump the mining gear, in hand and working or preorders. That may change over the next several increases in the difficulty but as of today it hasn't.
Also it's not other people's money, it's mine.
You should also be considering the amount of BTC you could buy with the funds that you have locked up in pre-orders. if that exceeds the amount that you will gain from having the mining, then it is obviously a better idea to get a refund & buy BTC.