I too avoid paying subscription charges as frequently as possible. I do pay for Netflix (which I may cancel in the future), which of course pales in comparison to what my ISP charges me for internet ($19/month my butt), but for things like office software, I simply won't pay more than once. To acquire a program, and then pay for it, then pay for it, then pay for it, then pay for it... to me that seems insane.
Just watch, it's only a matter of time before we start seeing subscription-based web browsers. "You payed for this software for three years in a row, but you didn't pay for it this month. Therefore, you don't get to browse the web." That's my prediction for the future, and I'm sticking with it.
Subscriptions are a very bad idea, and in the case of software and/or storage, I would opt for something that doesn't charge you subscription fees. For computer storage, this is as easy as buying virtually any HDD, flash drive, SSD, DVD-R, etc. Not paying for subscription-based software is even easier: there are many programs available for many purposes, and many of these programs are $0.