I haven't mined coins for a few years since I had a 570 GTX? (back in 2013). I was also using a distributed pool via bitcoin.de. I have zero coins in my account as the computing was a fraction of a full coin. FWIW, the processor also did one of those 'rollover service' things. All I can say about that, is if you are looking to bitcoin for long-term investment, you might want to spend it in Vegas instead.
I don't have personal experience mining on multiple 1080 Ti cards but I saw people mention 6x of those cards will exceed your residential electric capacity (like, not work because it pulls too much power). Thanks cyberreality on the details about your electric bill to mining output. I personally was not comfortable with the GPU running @ 100% 24/7, but I see the appeal of generating math money.
I chuckle and think of it as a monetized Seti@Home.