Don't worry, no penalty on nonresponse!
Today I got in my mail (snail mail) a survey invitation. It says "you have been selected by your institution ... to participate in a survey...". Not random, huh? That is not what led to this blog. The letter also says "... Though your participation in this study is voluntary and there are no penalities for not participating, your participation will help ..." I just felt that the letter was crying out "hey, say it only when you really really feel strong about it!"