The purpose of the OP was to provide a warning to
New customers thinking of buying mining rings from BFL that orders placed today are unlikely to obtain a satisfactory return on investment, and to give them some background so that they can better understand their expected return and make a more informed decision.
What is relevant to New customers is whether they should part with their money today or not.
At present Butterfly Labs are offering 5 GH/s, 25 GH/s and 50 GH/s units, at $274, $1,249, and $2,499 respectively plus shipping.
New customers must face the prospect of any receiving products ordered today in January 2014. By this time it is unlikely that they will receive the expected return on their investment over the life of the product.
As stated in the OP persons existing already in the BFL pre-order list, like you and I, and many others may make a lot of money.
The reason there is much aggravation amongst early adopters that placed orders for BFL equipment in 2012 that a 5 GH/s machine would make around $2,000 profit and a 50 GH/s machine around $20,000 profit with Bitcoin prices at $120 if started today and mined 24/7 to end 2014, and a hell of a lot more had units shipped when promised.
New customers could be better off to wait and see whether BFL will ever become up-to-date with the deliveries of outstanding orders. If they do a new customers can make more sensible decisions based on the current difficulty levels and this would be an excellent and ideal situation.
Congratulations, you made a good original investment. I hope you receive your two units very soon so that you can immediately start mining and make hay while the sun shines.
As far as the viability of units ordered today and received in January 2014, here are the continuation of the difficulty levels at 15%:
2013
31-Dec 15.00% 222,095,805
2014
11-Jan 15.00% 255,410,176
22-Jan 15.00% 293,721,702
02-Feb 15.00% 337,779,958
13-Feb 15.00% 388,446,951
24-Feb 15.00% 446,713,994
07-Mar 15.00% 513,721,093
18-Mar 15.00% 590,779,257
29-Mar 15.00% 679,396,146
09-Apr 15.00% 781,305,568
20-Apr 15.00% 898,501,403
01-May 15.00% 1,033,276,613
12-May 15.00% 1,188,268,105
23-May 15.00% 1,366,508,321
03-Jun 15.00% 1,571,484,569
14-Jun 15.00% 1,807,207,255
25-Jun 15.00% 2,078,288,343
06-Jul 15.00% 2,390,031,595
17-Jul 15.00% 2,748,536,334
28-Jul 15.00% 3,160,816,784
08-Aug 15.00% 3,634,939,301
Unfortunately the "BitForce 25 GH/s SC" from Butterfly Labs priced at $1,249 plus shipping only hashes at 25 GH/s, not 60 GH/s.
BFL products can be viewed on following pages:
https://products.butterflylabs.com/New customers thinking of buying mining rigs from BFL are warned that orders placed today are unlikely to obtain their Return on Investment.
At that diff. and current $/btc, a 60GH/s single priced $1299 will make $450/month, pays itself back in 13 weeks,
At that diff. and current $/btc, a 50GH/s single priced $2499 will make $373/month, pays itself back in 29 weeks,
good enough for me.
What has
"Unfortunately the "BitForce 25 GH/s SC" from Butterfly Labs priced at $1,249 plus shipping only hashes at 25 GH/s, not 60 GH/s." to do with it?
I'm was giving you the calculations for the 50GH/s and 60GH/s Single, not the LITTLE Single, at your own assumed 222mill. diff. for 12-2013, see what you quoted....
Besides that, the 25GH/s has the same payback time as the 50GH/s since it is half the price of a 50GH/s unit, so it would still be ~29 weeks, at your assumed 222mill. diff.
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