I don't disagree with the nature of your conclusion, though I think "frivolous" might be a bit extreme. I don't really see an issue with there being a perk like this for those who pay for subs, especially since the rewards are mostly minor QoL or cosmetic items (Most of which are available through other means).I burned another 48 Astral Shards and rolled...
96 Lesser Elixir of Discovery
91 Lesser Elixir of Discovery
52 6 Bigby's Hands
36 Collectibles Variety Case: 10 Strings of Prayer Beads, 10 Mortars and Pestals, 10 Charred Soarwood
To date, I have spent about 500 Astral Shards looking for the black or white horse with one roll of 99 and one roll of 96. For me, none of the items thus far received were worth the shard expenditure. Those shards would have purchased many Saga upgrades (Normal to Hard or Hard to Elite) and useful augments.
My conclusion is that gold rolls are a frivolous perk for subscribers and a waste of shards for premium players like me. Lesson learned. This is not a complaint, just an observation.
There's plenty of other actually valuable uses for Astral shards that I wouldn't be blowing them on a cosmetic as a premium player. That being said, it might be cool to see some tweaks to the Daily Dice: Letting you select an item from the loot table based on your roll, or maybe the tables below your roll but keeping your current tier random(Something mentioned here earlier); letting you do bulk rolls; letting you "stockpile" rolls and combine them to higher tiers (Or, letting you convert X silver rolls into a gold roll-maybe 5 silver?).
I also think it'd be nice to see Bonus Days for Daily Dice upgrade rolls beyond just the experience gems: Premiums get reduced gold roll costs without having to sacrifice a silver roll, and subbers get 1 gold per day. Or maybe everyone gets a boost to their rolls, so you automatically get bumped up to the next loot table. Something a little more whelming than the current boost.