Very true. My response was probably just my normal cynicism kicking in. Having said that, I do wonder if it's possible for a criminal to find a way of matching an e-mail address to a postal address.
That's up to you and how you've shared it. Got to google, do a search with your email address in "double quotes" and part of your street address. See if it gets any hits.
There could be a stolen database out there that has your email and address in it, but I don't see how this survey reduces your security . The person that has that information is not going around to your house to steal your locked bikes, he's stealing identity - or someone else's on the list.
If someone is looking for poorly locked bikes, the easiest way would be any high street or train station, rather than creating an internet survey and then piecing together the information to find ... um, what?
But I guess if you are concerned about security, you should probably get a second email address to use on throw away things like this.