To invest in Bitcoin, you definitely need a sensible income, why can't you invest and move forward if you have a mirror and don't have a good source of income. To invest in Bitcoin, you definitely have to be wealthy.
As soon as I think you are wrong here, you don't need to have a sensible income before you can invest in Bitcoin, all you just need is a discretionary income,
moremoney left after all basic needs have been met, once you you can figure out your discretionary income from your source, it doesn't matter how small it is, you are good to go.
And take note that you are terribly wrong to say that to invest in Bitcoin you definitely have to be wealthy, Bitcoin investment is open to all including the rich and the poor, as long as you have a discretionary income to get started.