I'm willing to bet noone will spend 500 emblems on a ship, ever. That's easily 50 days of effort.
I'd probably do it if I wanted to fly more than one refit ship...but, I only plan on flying one per character. That's what alts are for. Still, 500 is way too high and should be closer to the 200 that the Nebula costs.
I like that it costs a great deal of time to achieve getting an iconic ship to the franchise (beyond your free one.)
This game needs achievement loot and ships are the BEST achievement loot to create. You can get 500 emblems, which does take a good amount of time....or you can buy it with RL money. The choice is yours really.
I still have not used my free refit token personally, but I like the idea you get ONE for free, and the others take a great deal of time.
There are still other T5 ships you can get for next to nothing with EC. Refits are 1st rate ships and I like that a person can't simply get all of them in a month....it leaves something to achieve in the game.