Even though I'm a small SMALL-time keeper, I still have 45 Ball Pythons, plus a boa. My collection is worth a couple grand, not to mention the value it holds for me on a sentimental level. Why would I risk the health of my collection for a measley $10?

If you quarantine properly, treat every newcomer with P.A.M., and don't walk into filthy pet stores to fondle their parasite-infested snakes, then you shouldn't have mite problems. I still have my can of Provent A Mite from when I bought it 2-3 years ago.