I would say no. From my experience using gaming lagoon, I really only get tons of junk e-mail. If you are doing the "surveys" that tell you to input a phone number, it is likely that you'll get phones calls for the next week or so. If you just ignore the calls, they'll eventually go away.
I can't say that I've gotten any more junk snail mail than I get usually do. I still get the occasionally credit card offer or the occasional brochure to join the military.
So yeah give them a try. Just in case you aren't familiar with the "surveys", the majority of the time they aren't actually surveys. Most are just sites that require you to enter your personal information and sign up for newsletters and click no to a bunch of stuff for the next 8 pages. You get a real survey every once in a while, but not often.