You can trade bitcoin that way if that is what you want and if you can obtain those kind of profits then good for you, but many of the people holding their bitcoins are not really looking for small gains over a short period of time by watching the market all the time, what they want is to obtain big profits in the long term by not doing much except holding their coins.
If you are that good as a trader it could be a good idea to move to even more volatile markets, I have seen the market of some coins moving incredibly fast so the profits you could get could be way higher as long as you are willing to take the risks necessary to make money in those markets.