Well, I don't consider Sync to be overpriced. So clearly we aren't going to agree on this. Not only did I buy Sync Ultra on both Reddit and Lemmy, for a time I further supported Ljdawson on Patreon.
I spend up to an hour a day in Sync. So even amortized over only one year (and I used Sync on Reddit for many years) that's 27 cents a day. Chump change.
In addition, I view supporting the app devs as a boost to the Lemmy community. Isn't app availability apps why many of us are here?
Polished apps will grow the fediverse.