My ATO reservoir is only 12 gallons. And the toilet float has been in place since September and has worked just fine. The toilet float valve has worked just fine for me without a problem, and has cost hundreds less than other ATOs. The volume of my tank is so large that if the float stuck, it would barely make a dent in my salinity. I am at home every day, so if something was wrong or broken, I'd notice, but I have gone out of town and left it before, and it was fine. I do want to increase the size of my ATO reservoir, but don't have the space right now.
I don't have a lot of money, and I don't spend a lot on corals or fish either. All of my corals have started out as very small colonies (LPS I've bought usually only have one or two heads), and all my SPS have started out as frags that cost less than $10 apiece. In the last 3 months, I've spent money on one fish (Jill the vlamingi) and everything else I've gotten has been through trades at the LFS or trades at frag swaps. I don't have a lot of money, so I run my tank using what I can afford. It may not be the best way, and it's definitely not the only way, but it is a way, and it works.
I may not do things your way Fatman, but my way works too, and I'm not ashamed, as you say, to suggest ways other than yours.