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Well, I haven't yet taken the plunge to buy my own life-time membership. Seems the only way to make that pay off is to get a couple other people signed up under your own referral and have them buy their own memberships. The fees are so low that 80% back on them still isn't enough to cover the 17k+ BTS needed for the membership. At least, that's how it seems, but I may still pay the fee eventually if I continue to be as impressed with the ecosystem as I have been so far. :)