Is it true that User Testing earnings taper off?

I read from one person that when you start User Testing, you make lots of money for the first 3-4 months or so and then they start showing you less and less studies and the earnings get lower and lower. Has this happened for anyone else?

submitted by /u/GCIST
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source https://www.reddit.com/r/beermoney/comments/18yehzm/is_it_true_that_user_testing_earnings_taper_off/