Cleaning is not going to weaken your attys. Atomizers as a whole aren't meant to last forever, that's why they're called "consumables", but basic, regular maintenance can help them last longer. It's just like changing the oil in your car.
I totally agree, I have been using the Mistress Method described in previous post on my 901 attys since July.. and have not lost a single one. I clean them twice a week, and find that each time I switch to a clean atty they seem to work even better...IMO