Even with 0.15$/Kwh I wasn't either. I was still 'racking' in like $15 per rig after the costs. But the time I had to spend diagnosing things wasn't worth it all. Sometimes a riser would malfunction others the pool would just temporary ban my rigs for not sending in enough shares. I had GTX 1070s in all of my rigs. It's just that I could do better things with my time than diagnosing different issues every other day.
People as stupid as they are, they do not count things like that, if whattomine tell them they are making $0.15 per card they think they are making that, they are that stupid cause they might be probably negative -$0.30 per card, your hashrate is never 100%, sometimes is not even 80% real, if you have 1000mh's, your true hashrate is 25% less in the pool + risers and other things that you need to spend for everything to be functioning. The truth is, if 1 x gpu is making you less than $0.60 after electricity costs then forget mining, is time to buy coins instead.
I do think people take WTM values way too literally, as you said you could be making less . . or you could be making more
However some factors people always forget or like to leave out are --- you running these inside your home? how is that impacting your AC? Sure it can save you on heat some, but as someone who did that all last winter -- its difficult to do without getting hot/cold spots depending on your home.
I do think as far as heating goes it is perfect for a garage esp. w/ an uninsulated door as it'll bring the overall temp up to a nice area
But anyway my point was just that there are variations / luck + cooling cost of home and/or supplemental equipment like exhaust fans + the incredible time sink it is once a rig goes down, or even deploying a rig just to make a couple dollars a day with hardware that cost a couple thousand.
Disclaimer I do not mean to sound so negative, obviously I love mining and a huge fan of it -- but personally for me, GPU mining doesn't bring me in enough value w/ my setup / electric rate and these current low crypto prices.