IOCS is a not-for-profit research organization that conducts studies and experiments on shopping-related behavior – things like how we, as consumers, evaluate products, how we make the buying decisions, etc. Although the focus is mostly on shopping related behavior, some of their experiments and studies include broader areas of marketing, psychology, and economics.
Some websites, like eBay will pay you as much as $6 to sign up to their sites and place bids. Another website, Stamps.com, will pay you as much as $10 for signing up for their free trial program. However, with the latter, if you do not cancel the free trial before expiration, then you will be billed monthly for their programs (in the case of Stamps, its $15.99 per month).