Some people see Bitcoin as a source of income and they wait patiently for it to grow so they can sell and it profit especially those who are traders, a lot of people see it as there only source of income but we forget Bitcoin is very volatile and anything can happen at anytime one can be expecting to get a huge profit 3 years to come from Bitcoin and Bitcoin falls, this has caused a lot of people depression and it is advised that will use our Discretionary Income to invest in Bitcoin.
Some people says before investing in other business you must make sure you have accumulated enough Bitcoin but that's not it one can still invest in a business that will give you income while accumulating Bitcoin especially for those who are not long term Bitcoin investment.
When you build another business that brings you good profit it will help you grow your Bitcoin more bigger.
Building another business while accumulating your Bitcoin is not a bad idea, and is very much possible, let's all stop seeing Bitcoin as a source of income because it may cause panic when ever there's a dip or fall in Bitcoin.
There is a bit of misinformation in among your claims. Bitcoin doesn't generate any value by itself, it is not like a company that is making profits every year and will potentially cash that out (or retain it which should increase the share price by the corresponding amount). This leaves the second point about earning money from it as a trader - they make the most profits when bitcoin is acting volatile, with big swings up and down in value, yet when it becomes more stable over time this ability to make profits will evaporate - although altcoins probably offer this ability. If you have made a large profit from buying bitcoin at an earlier point, it is probably better to diversify.