Seriously, unless you're deeply passionate about the vision of the company you're working for, it's super important to keep tabs on the market and leave companies that are (for lack of a better term) taking advantage of you. Unscrupulous employers, especially traditional scrooge-mcduck-business-entrepreneurs, will try to squeeze you as hard as they can while paying you as little as they can (a good rule of thumb for spotting these men and women is that they're in their business just to make money, not to chase some "nobler" vision). So it's critical that you get out as soon as you can not only because it'll be better for your financial and emotional well-being, but also so that you don't lower the market wage average of your profession and wind up hurting all the other people in your industry.
People can still be good bosses/owners if they're solely in it for the money. They important point is that they have an accurate picture of costs and value.
Some penny-pinching bosses can be annoying. One boss fired a guy that got paid a lot less than me, but then I had to take over his tasks, which meant I was doing a lot more low-value work (updating pages on his WordPress site) instead of higher-value work (programming).
Actually, the finance sector has this figured out better than most other sectors imo (just consider how much bonus they pay even their lowly analysts after working them to death). A good boss / company there ought to be more about earning money than having money, and so should spare no expenses rewarding employees who bring a lot of value to the corporation... So my point is you want an employer who has the character to reward everyone in the company (including him/herself) based upon some open and fair system of value contributed / need without being prompted, rather than someone who will pay you what he can get away paying you.
But deciding that most inner quality of character is difficult (since it's an hidden attribute on people), so it makes sense to look for various outward expressions of that hidden trait... one of which I postulate to be the question of whether your boss is in it for money, or in it for a vision. In the finance sector, where it's only about money, my postulate admittedly breaks down.
