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I want you to understand that when we say income is steady it means that it is not constant and so an investor doesn't need a steady source of income but rather a stable source of income because of stability. When someone has a stable source of income and they are determined to invest in Bitcoin, they will definitely grow there portfolio more than one can imagine and just like you said any investor who is doing well without a regular source of income ( without a stable source of income), if they are opportune or privilege to have a stable source of income they will wonders in there investment.
Stable income can be interpreted as your regular source of income every month regardless of how much it is. Businessmen or entrepreneurs or influencers do not have a stable income, but they have an income above the average employee in general. Financial conditions will be stable if someone has more than one source, that means you have an unused budget that can then be used for the accumulation plan.
Besides, I can’t say that everyone who has a stable monthly income wants to accumulate. Some will certainly accumulate, while others will spend it on things they want to get. If I feel that the assets I hold are enough for a while, then I will shift my focus to other things that are a little consumptive because after all we need to enjoy life instead of always thinking about investment.