You can play APs for PFS credit.
If you're doing that you're not a PFS only player anymore. PFS runs individual single session adventures. Once you're running an AP you're out of the repeatable french fry pick up group organized play paradigm and don't need to use organized play rules. Your AP characters can't transfer over to PFS anyways because PFS stops at the same level as the shorter APs. Even if you're still playing at the game shop that's a closed group, which is what people mean by home game. Just like we call it table top roleplaying even when using map software over the Internet.
Obviously someone who plays both PFS and home games will tend to buy stuff for both PFS and home games, but they also wouldn't leave the hobby if PFS stopped since they're playing home games. They would probably stop buying new rules line books they could use the SRD for home games, but they'll probably do that at some point anyways. Surely you've noticed the trend towards rules fatigue lately? And that's among people interested enough in rules to talk about them on the Internet.