Simple answer: people who knows how to negotiate a better deal often be able to negotiate a better salaries.

Now tell me who is a better negotiator: business analysts or programmers? (I skip project managers because quite a lot of them were programmers one point)

Or put it this way, if those programmers feel that this is not good and continue to work in a company like that, it would be their own problems since they either couldn't change the situation, or they don't know how to express that to who pay them. Not to mention if the company itself also makes even more money in some cases.