Why did this never occur to me before?

I'm writing up the magic item section for TSR-East. Realized I'd not put in the note on 10% of magic armors being cursed. Noticed the lower encumbrance values for magic armors.

I'm sure this has occurred to many of you, but since I've never been a real stickler for encumbrance rules (eyeballing it seems to work OK), I never had this idea before in 35 years of gaming. And I don't remember seeing this in any published modules, either.

A cursed magical suit of armor. It has the normal plus value to improve AC. But it has double encumbrance instead of half encumbrance. And like normal for cursed items, once worn you're compelled to always wear it.