Obviously, being a PDF author and retailer, I can't help but feel you're being hideously foolish - there's some incredible products out there. A minor outage is no different than the FLGS being out of stock, though a major outage is something else entirely.
And unlike the FLGS, which is great all by itself, if you need something right then, you can grab it and print it out.
Not interested in a print vs. PDF argument here - and folks starting one'll end up ignored for awhile - because both avenues serve their own purposes and have crossover as far as customers go. I'm just commenting, admittedly sourly, that putting all the eggs in one basket means that when the basket tips over...well. Look for yourself. Diversity is good.