BFL Says all Back orders should be filled in 90 days... (will see if it really happens but they are shipping more and more each day)
Lets say if Diff is 100,000,000 in 90 days, which I doubt it will be that High(My Estimate is 100,000,000 by Nov 2013)
At 100,000,000 My 4 7 MH will get about $480 per month... I can live with that.. But yes it is a gamble and cutting it close..
Congrats to all those who took a chance and ordered last June.. They and doing real well right now..
Are you
sure you did the math right? Using the calculator
http://coinish.com/calc I get $3.09 (0.028
BTC) per day at diff 100,000,000 for 5.5GHash/sec Jalapeno (ref
https://bitcointalk.org/index.php?topic=227101.0 which is a nice post). That's a lot less than $480 per month. Don't forget to play with expert mode to see the effect of difficulty rise on ROI.
I agree with your last point, the early orders
will make a killing, just not anyone ordering today.
[Edit]Or maybe you meant to say you've ordered four BFL 7GHash/sec (the upgrades). That would be about right for $480/month (but you'' still need to account for difficulty rise in ROI calculation). How much did you pay for them?