I find it hard to believe that there are no groups grinding fates on your server, there have to be... somewhere. That aside, there's always guild leves. I'll be honest though, it'd be nice if fates scaled to the number of players participating.

If you can't find a fate group make one, or maybe get your linkshell to help out, even if someone has all 50's company seals can still be usefull. At the very worst you can buy consumables with them.