I'm not strictly a vegetarian/vegan for similar reasons; however, I've found that by trying to eat extremely cheaply, I end up basically as a vegetarian by default (aside from the occasional piece of bacon in my canned beans). Nevertheless, I do tend to gravitate towards meat products whenever free food is available, and my diet is still a ways from vegan. In my case, I don't think purposefully trying to avoid animal products would be worth the additional stress and chance of burn out.