Mining can be profitable but not as profitable as trading and gambling. Because mining really do takes a lot of time. It also consumes a lot of electricity and your computer might also face some damages due to overheating.
It is a signature campaign where members are paid to past maximum of five, members have to be displaying the signature for CryptoTalk below their every post...that is the meaning of signature campaign in the forum. The signatures are all pointing to this forum.