They also added Frayed Pouches and Frayed Sacks, so... cheaper/easier WoE weaponskill unlocks I guess?
At the number required to complete the upgrade (and anything less than full is completely pointless these days), these in all fairness are pretty pointless.
You need WoE access to unlock the Empy ws across all jobs, so why not just farm them? You need a lot more dice/liminals to complete a stage than you are able to get from a campaign, its very different from empy +1/+2 items.
Coins are a bit more useful as you only need 30, and don't cost that much in login points, but liminals in particular at 2k per pouch are stupidly expensive, you'd be mad to buy them.
Gobbiebag completion items are worthwhile for the last couple of stages, but below that... I suspect you could make more gil by selling other things.
Couple of points regarding Limbus mats: Materials can be shared across the same account, which is great if you have an alt-char especially now that CoP can easily be soloed through to completion (aside from the stupid 2-lock door in sacrarium... which is still an annoying cockblock). Just remember that they cannot be sold or bazaared, unlike ABC's which can be bazaared but not sent between chars.
To be honest I think most people will be best off simply buying the AF109 mats (Beetle Blood especially) and AH'ing them for gil.