Yeah better ur btc sit in cex and making u some small profit than sitting in ur wallet doing nothing
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That is just not true. In general, the more you mine using cex.io, the more money you lose. You are much better off holding BTC in your wallet than buying GH/s and mining. This has been shown many times already.
Here are the ways a profit can be made on cex.io:
1. You buy GH/s at a much lower price (below 0.012 BTC), and you mine.
2. You trade frequently and you are very good/lucky.
3. The difficulty remains flat or falls (possible, but extremely unlikely).
4. Spam referral links (as suggested by MICRO).