I don't work nearly as much or as hard as I once did, but on working days I'll probably go through 2-5k converters. All of my characters at this point are self-funded, but it's only the factories that I get a little squirrelly about when I'm holding under 1k converters. The only time I'll aggregate 10k on an alt is if I'm doing some sort of project and I want to track how many converters I used. As far as unused converters, I probably have plenty of them spread out everywhere. But then again, I'm a sloppy worker sometimes, and I'd much rather have them and not need them than the reverse. My inventory management would make my manager scream.
Well, to me it's not the 1000 clicks, it's the switching to at least 5 different alts in order to do it. Generally the characters I have that need converters are the ones with the least amount of spare AH slots to buy them. But they people I really pity are those selling 10k converters at 10 a stack!