No, it's not, it's just a rumor. You only can get below 10% of your investment. Just try to do short-term trading with bitcoin. You will feel it your own it's big but not big enough. If you investing with a lot of amounts bigger profit you will get.
Not everyone is suitable to do day trading. In fact it is one of the most tiring things to do to get money. Some people prefer to hold few coins then come back months later to check on it. Having alot coins doesnt guarantee you to get more profit .
Yes, bitcoin is very profitable because bitcoin has a limited supply of only 16.7 million bitcoins in circulation worldwide. And yes, there is high bitcoin demands. thus, the demand of bitcoin is higher than the supply. You know once the demand is higher than the supply what will follow which is inflation.
Fixed supply at 21 millions actually. There is almost no real demand for bitcoin right now except because of it high exchange rate currently and people just want a piece of it to get some quick profit