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Indeed, that was the reason when lost interest on BTC; pools, ASIC and miner fees. At first, there were no fees, since the miners were happy if they got a random reward every now and then. Greed kills good ideas without exception.

When I started mining BTC, it was still barely possible with CPU... It took about 2 weeks to reach minimum payment. If I had had a compatible GPU I would have reached the minimum payment a little faster.