Shooting stars right now aren't really mined. I've logged on during peak hours and nobody has mined the star that landed 6 hours ago. I think it's because the rewards aren't really worth it. The mining ring is great, but it will take only 2 stars to get it by yourself. The experience is a joke. 50 stardust for 1k experience is nothing, but it's alright because the star gives you exp. The dragon pick is priced approriately imo but it's not worth saving up for as it's the same mining speed as a rune pickaxe and it's only use is the special attack.
I'm suggesting changing the dragon pick to be faster at mining rune ores/gems and to add two new items to the shop.
http://2007.runescape.wikia.com/wiki/Coal_baghttp://2007.runescape.wikia.com/wiki/Gem_bagBoth of the new rewards are mining related and wouldn't affect prices.
The coal bag wouldn't really help with mining more ore because you can use the barbarian teleport and the G.E. teleport to mine coal with almost no time in between banking and mining. It's main use would be with superheating. Since it's not really that helpful I think
1.5k stardust would be a good price.The Gem Bag however, would be really, really useful for thieving and especially mining gem rocks if you wanted to bank the gems and sell them.
3k Stardust would be a good price imo.