I think I might have felt differently at a stage of my life where I didn’t have nearly as much disposable income as I do now.
Over the past few years, I’ve adopted the attitude of trying my hardest to pay for the things that I would be genuinely disappointed if they went away.
I have system-wide ad block, so the $20 or whatever for Sync actually bought me nothing other than the knowledge that if LJ decides to pack up Sync and go and work for a FAANG instead, I don’t need to feel guilty.
This attitude would be unrecognisable to my younger self.
If anything, I think LJ missed a trick by not having the option of doing a double subscription (so £3.99), and saying the extra £2 gets split between the instances, weighted by the time you spend time on them.