Kanos, it'll be right on its way to you, promise!

DK, yeah, I don't think it's worth it for any but a few modern era figures, and that again is only if you feel the strong compulsion to solidify a monetary value of the figure, or, in my case, are doing it as part of a display idea. It would cost a fortune!
After doing this, I think I’m scrapping my plan to do one of every modern cardback. If I did, I’d have to do:
POTF2 Orange
POTF2 Green
POTF2 FF (done)
POTF2 Flashback
POTF2 Commtech
SOTE
EU
E1
E1 redesign
POTJ
Saga 2002
Saga 2003
Saga 2003 redesign
SOTE
EU
Star Tours
CW
CW Animated
OTC
VOTC
Theater Edition Luke
TF Vader
Sacul

That’s
22 23 cards right there! Never mind the cost, my intended display probably would only make sense to emphasize perhaps 6-8, tops.
And that’s omitting things like POTF2 Green with Holo, the bogus silver carded exclusives, oddballs like the Battlefront giveaway Biker Scout, and international cards.
There’s also the issue of how to grade a VOTC figure, since it comes in the outer clamshell. It’d consider a carded VOTC figure as incomplete without the clamshell, but it would be pretty funky and nonstandard to throw an acrylic case around a plastic clamshell.
EDIT: Damn, forgot Star Tours figures!