Two gold rolls so far:
First was 3-4 collectibles, none worth remembering
Second was Large Jewel of Fortune
Of all my silver rolls, I've won a 35 astral shards a couple of times, some XP pots, Guild XP pots, a few AS once or twice. At least it gave me enough to put stuff on the ASAH to earn more (though inflation is hitting the ASAH just like it did the other, or maybe it is just ridiculous pricing).
I agree with posters that point out that winning an item plus a coupon would certainly entice me to spend TP. Winning a coupon for bonus TP upon a TP purchase would also entice me to spend, since I time my TP purchases to double or triple bonus points offers.