A Silver player could play 3 years and never spend a dime. There's not much incentive for Cryptic to reward people who have never spent money.
A wiser choice would be to give Zen Vet Rewards based on how much Zen you've purchased directly from PWE. If you buy 5,000 Zen it's like Tier I Zen Vet, and you get X. For each 5,000 Zen you move up a Tier and get a better reward. That way there's a financial incentive for Cryptic to put man-power into creating said rewards.
STO is about my Liberated Borg Federation Captain with his Breen 1st Officer, Jem'Hadar Tactical Officer, Liberated Borg Engineering Officer, Android Ops Officer, Photonic Science Officer, Gorn Science Officer, and Reman Medical Officer jumping into their Jem'Hadar Carrier and flying off to do missions for the new Romulan Empire. But for some players allowing a T5 Connie to be used breaks the canon in the game.
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A wiser choice would be to give Zen Vet Rewards based on how much Zen you've purchased directly from PWE. If you buy 5,000 Zen it's like Tier I Zen Vet, and you get X. For each 5,000 Zen you move up a Tier and get a better reward. That way there's a financial incentive for Cryptic to put man-power into creating said rewards.