Pinecone asks for your address because your first payout is sent via check to your address. After a few surveys they offer you a paypal option. As far as sending products to test, these are related to the survey you take. I have been with them for a year and they have only sent a few things for me to try out. In the survey, they ask if you would mine trying the product and you can decline. Pinecone is a great company to do surveys with. I highly recommened them!
After joining a survey site, you provide some personal and demographic information, which legitimate survey sites will keep private. That information will be used in choosing participants to take surveys on certain goods and services. If you get selected to take part in a survey, you will be notified through mail to take a short survey to see if your profile suits that survey. When you are deemed qualified, you will be requested to take a longer survey.
Paid survey site companies invest billions of dollars into marketing research online. They always want to find out more intricate details of a consumer's relationship with their product. Whether it's a new television show or just an existing product line, companies like Disney, Samsung, and Sony go to great lengths to find out their ideal audiences.