Avoid bonus systems. Bonus systems do not work out well for non-executives. Look at the story again: the kid made out better than anyone because his $175/hr is his for as many hours as he works no matter how the company performs that year. He gets his "bonus" every hour he works. The senior dev has a whopping 30% of his yearly comp tied up in a nebulous bonus that probably gets paid out far enough into the next year that he's already earned about half of his next bonus by the time he actually gets it (i.e. makes leaving expensive).

The bonus system was originally set up for high up executives to tie their comp more exactly to company performance since they are responsible for it. As a dev you are not responsible for company performance. Are you able to sack the sales team if you feel that they're not competent? Are you able to change company direction? You can't be responsible for something you have no ability to change. People saying you do are just manipulating you to their own advantage.