Signature mappings pay too lite to go full time, but it's a good bonus. I would try to resist the temptation of buying stuff and I would save 100% of the BTC that I make online with signature campaigns, and try your best to reach the 21 BTC goal before its too late. Who knows if a signature campaign can make you rich in 10 years.
Sorry, what is 21 btc goal? I read that amount numerous time but never really understand why 21 is so special. I mean, its not the maximum amount of btc we can have, right? So what's so special with 21?
There are 21 million bitcoins that have been generated, so if you hold 21 btc then you are one in a million as the production of bitcoins will never exceed more the 21 btc even in future.