Why is the minimum payout so high. My computer mines so slowly that it will take me months to reach the threshold.
Slush has to add a small fee to every payment. If the threshold was lower, this would become a substantial part of the pool's running expenses. As Slush takes only a small cut for running the pool (2%) there has to be a limit, or some people would claim every tiny amount they earn, and the thing would be unsustainable.
Are you mining using only a CPU or GPU? If so, you are probably not covering your running costs anyway unless you get free electricity.
I have a nvidia gtx 660 ti gpu. I have switched to scrypt mining because I only get 100 M/hash on my card with bitcoins, and I don't have the funds to upgrade to an ASIAC miner.
Still I have 0.00098937 Btc in my account that I want to transfer, but I would never be able to reach the minimum payout.
You coud have earned more by doing something useful instead of posting on this topic.