Storing things dry is never a good idea. I'd rather have them full, and seafoam added than stored dry any day.
I've honestly never had a fuel issue, other than a bad fuel line. I replaced the line last year, and it was original from '93, so it didn't owe me anything.
I've burned fuel that was almost a year old with no issues, so I'm not really sold on the whole fuel going bad theory.
I do, however, try to run ethanol free fuel all the time. The only time fuel with ethanol goes in my outboard is if I need gas, and have no other options, and I will only get what I will burn put in the tank.
I'm lucky to have a few local gas stations around me that are 100% ethanol free, so I use them always....or shell V-power when away from home.
S.