The current rewards are rather diverse containing minis, tonics, armor pieces (well, you’re most likely getting it for the skin), ascended accessories, and reward bags. However, I wouldn’t mind seeing more “big ticket” rewards in the bandit crest vendors.
For example, why not introduce a 250 use silverwaste shovel that costs 2k crests and maybe 25 gold? (That would be equal to 8 crests and 10 silver per shovel.) Or maybe a bee backpiece that has bee wings for 3k crests and 10 gold? Maybe a 10k crest and 25 gold mini-pact airship mail carrier?