This is because a programmer's contribution to the "20M profit" is not easily quantifiable and measurable being that he is mostly likely part of a team working

This is because a programmer's contribution to the "20M profit" is not easily quantifiable and measurable being that he is mostly likely part of a team working on a feature that is a part of a whole. However a lawyer who wins a case or a sale person who sells a big deal can easily point to the quantifiable win to a specific dollar amount.