I've recently ended up chasing fewer than that.

I made some purchases from the e-store and many didn't show up, including quite a hefty one that, with double bonus etc., was worth around 2,500 Avios.
While I was chasing that, I figured I'd chase all the purchases that didn't track properly.

Cut a long story short, I'm now left just chasing one outstanding one that's worth around 80 Avios. If they don't post, I'll not be too bothered (but will end up being "sod's lawed" 78 short of something )