Originally Posted by woj

they make about $16 per day now, or $16*14=$224 every 2 weeks
difficulty rises about 30% every 2 weeks, meaning your income drops by 30% ever 2 weeks so:

week income
1 $224.00
2 $156.80
3 $109.76
4 $76.83
5 $53.78
6 $37.65
7 $26.35
8 $18.45
9 $12.91
10 $9.04
11 $6.33
12 $4.43
13 $3.10
14 $2.17
15 $1.52
TOTAL $743.12

so in 15 2 week periods = 7.5 months or so, you would make about $743 total
+ they burn about 400W (??) so they use about $1/day in electricity cost = -$200 or so
+ it takes time/effort to set it all up, sell btc, etc

so add it all together = unprofitable