One of the most important ways to determine whether respondents are interpreting questions as intended and whether the order of questions may influence responses is to conduct a pretest using a small sample of people from the survey population. The pretest is conducted using the same protocol and setting as the survey and is typically conducted once the questionnaire and procedures have been finalized.
Illegitimate companies and scammers have a simple objective. They're after your information in order to get your money. It's much more common for internet scammers to target hundreds of people for small sums rather than a single person for thousands. This is because demanding large sums for a product that is somewhat unclear is an obvious red flag to most.

“I participated in an in-home product trial study. A coffee machine company sent me one of the coffee makers along with about 200 coffee pods. I received $7 for completing 3 short surveys. Plus, after the study, the company said I could keep the coffee maker. So, I got like 4 mos of coffee for everyone in my household, a free coffee maker and $7!” - David W.
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