Oh come on, I don't think the comparison is valid
With no disrespect to professional pilots all over the world but any Tom, Dick or Harry can pass the professional pilot exams (you're even given the answers to memorise!!!

) and hence become a professional pilot..... it takes a lot more nous to work yourself up to being a partner in a city firm.
I guess that only a top few percent of pilots could do that.
Besides, even FO for a "Big" will pay way more than the national average, why be greedy!