Much easier to manage ich than to eradicate it. One silly mistake and you can get it again. Too much work for me. I have had my fish for over 2 and a half years now, they all "have ich" but none died, including expensive wrasses and tangs.
There was a day in which I saw a bicolor blenny I had be infested, I swear he was fully white because of the ich, I tried and tried to get him out of my tank to treat, couldn't catch him. So I decided the destiny would decide whether or not he'd live. I started feeding a little heavier on the frozen food and, one day he was fully normal, not even a single spot. After that, I decided I woulndt make any effort to eradicate ich ever again, I am convinced they can fight it off on their own as long as they are healthy.
@hzheng33 can attest about the bicolor blenny as I gave it to him...