Is it worth spending time to collect Bitcoin rather than having a daily job? What I mean is that can bitcoin be more economical? Has it ever happened that people lose their investment value rather than benefit from spending it on bitcoin?
No. You keep your daily job and then collect bitcoins with money you get from your salary. Because collecting bitcoins would require you to place money or buy bitcoins from exchanges. I wouldn't recommend you to buy a miner but rather place money on them.