I don't mind rebasing stuff when it's just stuck with PVA, but the milliput based stuff is a pain. I'm mostly rebasing to standardise rather than to fit a particular ruleset. My Crusades collection is my first and biggest but a was still experimenting with basing when I started it, so I've long been unhappy with how they were done.

I'd rather rebase and reuse than leave units languishing unloved. I hate waste. For some I'm just putting fresh basing material over the bright yellow milliput basing but for most that are wrong sized I'm doing full rebase.

When I need to rebase I tend to trim existing bases to fit a new one - saves some trouble.