Or let's say if you have technical skills you don't have to do signature campaign anymore because taking advantage of your skill by doing a business is very profitable.
Let's say you are highly knowledgeable in trading - you don't have to do sign camp anymore! Will you have ample time of posting here when you are very busy making money in the market? I think not.
Maybe not "ample" but just enough time if you know how to manage yourself. You're not going to watch the market 24/7. In trading, you simply have to wait for the right time to buy/sell or you can just put a buy/sell order. You're not going to be very busy just because you know how to trade. It's not everyday that the market is moving enough for you to have profits.
If you really want to earn money, you would still have time to post here even if you're trading as well. After all, having multiple source of income is a great way to make bitcoins.