If you want necrose, the 75K-150K(?) sticker is definitely worth it. It wasn't that hard for me to get either character either, but overall it definitely cost more than that. Or you can try buying three FF packs and try your luck, you'll probably be looking for the customizations at some point anyway.
will rux be selling nec'rose sticker every time he comes?
Rux is total disappointment in the last 5 months so don't expect too much.
If not mistaken, he only sold it once or twice then never again.
I occasionally check Rux on my daughter's and wife's accounts, the former having quite a few characters and the latter having pretty much just the defaults. They are usually offered some sort of character sticker. This time around my daughter is being offered a Toxic Brainz sticker and I forget which character my wife was offered a piece of but I think it was a standard super rare. Every now and then Rux offers a frontline fighter sticker, but I wouldn't count on it being consistent by any means.
As I said, if one has a goal of eventually owning nec'rose, or any other DLC (e.g. toxic citron) or legendary variant, then a character sticker from Rux is a bargain compared to the number of sticker packs one must buy to get the sticker.
