Semi-creepy marketing

Somehow it's OK, I guess, when Amazon shows me recommendations when I check in or by email based on what I've purchased in the past.  But I'm now getting a couple of calls a month at the office from technology vendors who are monitoring hits to their web site to identify possible customers.  A typical one starts out something like, "Hi, this is Joe Schmoe from Superduper Network Services and we've noticed that someone from there has been hitting our web site multiple times recently."  I'm already innundated with vendor calls, so this seems one more semi-creepy excuse to pick up the phone.  --Dennis