It's not just the crappy gas that turns to shit in two weeks, it's also all the stuff that the gas affects. The ethanol has a deleterious affect on everything it touches. A case in point is my rarely ridden '94 Bimota DB2. Essentially a 900ss with a fancy frame and bodywork, I was having to clean the pilots about every Thursday, which is not an easy job since the single pc front fairing must be removed to get to them. The jets and tank were clean, but it still plugged up.
Long story short, I finally replaced all the fuel lines, the filter (OK why I didn't do this before is a mystery) and had a buddy ultrasonically clean the carbs - then new jets etc. The bike now runs fine and for more than a week - and only no E gas going forward. In retrospect, I think it was disintegrating fuel lines and the old filter.
May my laziness and stupidity be a lesson here.....