Labour for me is human productive effort towards achieving set target.To answer the question, labour may be wealth, in the sense that when others labour while you fold your harms and watch from where will the wealth come from? Wealth creation cannot be separated from human effort both mental and physical.
From your post, I understand that labor is itself a source of wealth, and investing in it will increase your income. Your post highlights several key points about labor and wealth, and your stance is that wealth cannot be increased without labor. However, as I interpret your post, I would argue that labor is not the only reason for wealth. Labor is the one who follows orders about what to do and what not to do, the driving force behind it is the mind of the owner, who calculates everything and creates plans for increasing money. Labor is merely a means to achieve the goal. I respect your concern about labor, as they are important for society, but it is not the reality that they are the main factor in acquiring wealth. Wealth is also inherited from parents to children, so also keep in mind it.