Nice try, but you are cherry picking your numbers to try and make your case.

What-to-mine for instance, uses a block reward figure of 2.91 to account for the fact that a pool will hit uncles once in awhile and not always get the full 3.0 block reward. Coinwarz, the site you used, estimates the full 3.0 reward so it will of course give you a higher result, but it is not a realistic number.

The second issue I see is you also cherry picked near the high price of the day for your Bitcoin value. Try using the low of the day and see what you get, or at least the average.

I used your other figures and adjusted the values in Coinwarz using 2.91 block reward and $3700 BTC price and your income drops to $2.67 per month.

Finally for the $3 or so you might really make per month, you are not taking into account the depreciation of your rigs. You proudly claim my "rigs are paid off" then go on to tell us how clever you are with making a few bucks a month with that equipment. What you fail to account for is that your rigs have value on the resale market and this value goes down each day.

So while today you could maybe sell your stripped down rigs for say $2,000 (just guessing as you didn't provide any details of what your equipment consists of but will work for an example) and you continue to mine for 2 more months (60 days) eking out a measly $2-3 per month, you would earn $6 extra. However in that same time your equipment value falls say $100, now it is worth only $1900, you effectively lost $94.

Even using your optimistic (but incorrect) $20/month estimate, you would still be losing $60 over the time period.

No, mining is not worth it, and only those who either truly have free or next to free (2 cent) power are making it and everyone else is using fuzzy math to delude themselves into thinking they are still making money.

If you want to continue mining, that is fine and you don't need to try and justify yourself to anyone else, but at a minimum at least be truthful to yourself and know exactly what the real costs are. Also do not try to peddle this false pretense to others just because you choose to continue to speculative mine in the hopes that coins go up in the near future.