Yeah $150k in DC is comfortable but far from luxurious (if you have a family, which it seems like most congresspeople do). It would not be enough to incentivize me to do the job of a congressperson.
Mark Zuckerberg's salary is only $1 a year! He must be homeless given bay area housing prices!
Right, I get that they make most of their money from sources other than their salary. But that seems like something we should aim to discourage, as it is pretty ripe for abuse. It is clear that many of them trade on non-public information, and for those that own businesses there's a lot of incentive to push legislation that helps the business. So if we were to ban most of that and have them live just on their salaries, I think the salaries should be higher given the challenges/responsibility of the job and the area they're living in.
Also consider the need to maintain a home back in their home districts.