Well, like any cel purchase (and most non-
essential purchases), it's always important that 
it's worth it to you, regardless of it's supposed 
innate 'value.'  What a collector would prefer is 
up to them.  Some people (like myself) have 
embraced production paper for collection.  Some 
people just aren't as interested and would rather 
buy other things... rilezu cels might be that 
other thing.

I have seen some limited edition cels appreciate 
in value over what they originally sold for.  
It's too early to tell for a lot of the rilezu 
though.  They are indeed limited but of course, 
you never know if the company will make more... 
maybe not of a design they had limited to 10 or 
50 or whatnot, but of a similar scene.  They are 
very beautiful though and 1) official and 2) 
related to the actual production work, unlike fan 
cels which usually can't derive from the original 
production.

If you like them and it's worth the price to you, 
then go for it.  If not, you can wait around for 
genga and douga to hopefully appear (sadly, I 
keep reading about them being destroyed 
afterwards) if you prefer those, or you can 
collect other mechandise from the series.

I hope this helped!

Keys
~recently updated~