I was about to purchase a KNC neptune until I ran over the math.

https://www.kncminer.com/products/neptune-second-batch

If there not shipping till May - June why would anyone purchase these when the difficulty of bit coin will rise so high?

When it would arrive you would only make 2 Bitcoins in your first month.. Less the one in the second then half again the next?  With the price at over 12$k with VAT wouldn't you be losing a a lot of cash?

http://bitcoinwisdom.com/bitcoin/calculator

5-1 – 5-31 (136 days)    15042 M    2.094    2.052    25.14
6-1 – 6-30 (166 days)    33047 M    0.9941    0.9743    26.11
7-1 – 7-31 (197 days)    55850 M    0.4926    0.4827    26.6
8-1 – 8-31 (228 days)    122 G    0.1973    0.1933    26.79
9-1 – 9-30 (258 days)    207 G    0.05148    0.05045    26.84

Am I getting something wrong or have people over looked these facts?