From what I gather, unless you're always the same on your demographics this isn't good. But if you've been doing that a while they don't seem to have tagged your account as fraudulent - maybe because you have been consistent in the different demographics sets. Who knows - there are many people on here better qualified than I to answer your post, and I don't want to be thought presumptious!!! At this point though for myself I'd feel safer using a different set of demographics with the address of the person they belong to.
I also want to clarify something. After I post about making some mistakes on my demographics, here I am feeling small after getting scolded for it and smaller yet after others post about how consistent and careful they are. I would like to point out that actually I HAVE been fairly consistent for over 2 months, except for 2 bad days this month last week that I know I had when I was actually sick with nasty headaches and exhausted - when I did get more in a desperate hurry to get a survey and get thru! Those days I didn't catch my errors very well. Other days, I was certainly more careful about catching any errors or typos in my demographics. And now I shall certainly be the model of consistency - and maybe not be so stubborn about trying to get surveys when I'm not feeling well.
Forgive me this too long post.