When i went there a few weeks ago i was getting at least 1000+ each time. My record, so far has been about 4000 and something. (I was using chinchompas)
It's been proven that pick and mining level don't matter. It's who has the fastest connection and 'clicks on the rock' first is the most likely to get the ore.
smithing. It's always been a nice goal of mine to smith my own stockpile of rune. =) Also, if i ever get a barrow set, then I'll be paying half price for everything =)
I've got 3 but I've got about 125 tokens left so I reckon I could get 1 more if I wanted. =p By the way, if you have a 'safe' amount of rune defenders you can use them to get more rune defenders rather than an adamant one. =)