Savage players get
-a mount from a4s, a12s, o4s, o8s, o12s, e4s and e8s, we could also assume e12s will have a mount drop as well, all these mounts have unique mount music
-Dyeable version of 8 man raid gear, there is no way around not doing savage for this and for a good amount of people it is a good enough incentive.
-a weapon, yea normal doesn't even give you a weapon no need to make it glowy if there is only 1 version of it and that 1 version is savage only, if they did another release expect said release to be all look at me all sparkly and glowy.
-BiS gear for current tier and Ultimates, this is another incentive a lot of people are happy to go in for just so they can see numbers go up and booms become BOOMS!
Savage has plenty of incentives to go in for it already but I wouldn't say no to adding crafting drops to every fight in the tier that allows you to get a glowy form of the savage weapon just atm I think adding Primal Weapons to DNC and GNB are probably higher on their to do if we can spare time list than new savage glowy weapons a lot of people haven't actually been asking them for.
Also most Ultimate weapons are reskins, Rdm and Sam weapons for UcoB and UWU are the exceptions, that is why they are so glowy to try and set them apart from the thing they responded especially when it had a glow version already(looking at UWU weapons specifically here).