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The difference is that the additional effort put forth in the sales process yields direct, tangible profits, whereas coding efforts are not always as easily quantified.

Think of this from the perspective of an owner. If you are going to choose between two sales guys, one who pulls in $10 deals and another who pulls in million-dollar deals, who are you going to choose? OK, now that you've chosen the latter, how much are you going to pay him? Since there's no simple way to come up with an arbitrary worth, say you settle on a nice big offer for him. What if he stops producing stellar numbers (due to personal deficiencies or market forces)? Do you fire him or reduce his pay? Doing either is sure to infuriate him if external forces are at play, so the only alternative is a merit-based commission system.

I'm not saying it's right for companies who only pay sales commissions and don't reward coders--there absolutely should be profit sharing and bonuses for programmers with measurable contributions to the company--but this process is in place simply because sales' efforts are infinitely easier to quantify and reward (from a profitability standpoint) than are programming efforts.