If it's on the order of $20, I'd pay $30 just to be able to say I'm 50% more ethical than an actual vegetarian.

That's not exactly true, since advocating vegetarianism has more effects than simply reducing the consumption of meat. For one thing, it alters how people think about and live their lives. If that $30 of spending produces a certain amount of human suffering (say, from self-induced guilt over eating meat), then your ethicalness isn't as high as calculated.