The short answer is - because your feedback is so valuable to the company that orders the test. Your inputs are combined with all other testers’ inputs, and the result is delivered as a complete report, which the client pays for. Some of that money goes to you and the other Testers.
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In some cases, the testers we need are difficult to find. Therefore, we raise the compensation amount This means that what you get for participating in a test can vary significantly. If the compensation for a test is unusually high, it is likely because we are looking for a very specific or narrow group of people.