Can't really say this one a bad thing to do. If you feel safer with the way you do and it does generate quite decent of money in a long run then it's fine to just keep it that way. Sure, leaving your comfort zone could make your income and revenue become higher but it takes time to actually learn what are you trying to do so you just not throwing away your money just because you are trying new things.

This just depends on what kind of easy you meant. Some of the stuff that is considered easy is fine to do as long as you know what is the risk and what action to do