Other than with cold hard cash, I've also been earning like $5-$10 worth of BTC a day doing surveys. It's a pretty slow and tedious (though easy) way, but I figure over the course of the year (if I stick with it) it will add up.
Never knew you can earn that much on surveys. Though I think you spent plenty of time doing it everyday. I still think the stress and the amount of time spent on answering tons of repetitive surveys are worth it for the amount of money you are gaining from it. It will add up, but it will likely not be the same if you just had a day job.