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).
Unfortunately, a lot of people think that because they didn’t qualify for a survey, the company conducting it is somehow scamming them. Remember, companies want to gather data and feedback from their target customers. Remember the Starbucks example above? Well, if you are not a coffee drinker, it makes sense that Starbucks doesn’t want to spend money on giving you a survey on something that doesn’t apply to you!
InboxDollars doesn't care to keep you as a customer because they realize most people once they reach the minimum $30 payout won't continue, because the amount of time required to earn pitiful tiny sums isn't worth it, so revoke your earnings as you reach the threshold is an intentional part of their dishonest business model. They offer no explanation and no flexibility and no reasonable business practices.
Not a “scam” in the sense of the word, but really not a way to earn any type of money. If you can find the companies that do the surveys and do them on your own with out sites like this you will make a substantially bigger amount of money. The “scam” is they take 90% (if not more, to be honest probably 99%) of the survey payout for themselves. Its the same for the “offers”, they will take the majority of the offer from the company, and give you a small percentage, And if that was not enough, they also take a percentage of your payout. This should be illegal as it is criminal to do this to people. 
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