One was a cell service provider that when you shared the service with friends and they signed up, you would get money off on your bill for as long as your friends used the service. Potentially you could end up making money as well. The other service that I mentioned...
Just second nature. I personally cannot imagine walking into a store and walking out with something without paying for it. Do people not have a conscious anymore? Even if I had a side thought of taking something, my cricket would be chirping like crazy (see Jiminy Cricket for reference)....