I agree with what untitled says, I am not saying I have experience in this area, but I am not saying I don't, if someone wants to find your street address, an IP address will do next to nothing. Remember when you search an IP address it doesn't pinpoint your house but rather the start of a postal code your IP resolves to or some sort of router in the area (not household routers). If someone has the ability to find your address you best believe they will probably find your IP one way or another, this doesn't even show your IP but rather just a close geographic area. Mine goes to Lincoln Nebraska, sure I am in Lincoln but I am 25 minutes away from that point.
Like untitled says, if you don't like it opt out but I like it as it shows where our members are coming from, and heck, you may find someone who is closer to you than you think which is sometimes cool.