Have always been in a kin, so never got any cold invites (in this game). Our procedure is to invite (people not already affiliated with a kin) with whom we have fellowed or raided (during or after). So we are familiar and have interacted with them before the kin-vite, and it is always preceded by talking (in /fellowship or /tell).
I would treat cold kin-vites like junk mail. I guess they work to generate interest for some people. If it is cold with no pre-/tell, I would just cancel it. If it happens again soon-ish I would check box out of kin-vites. Sending tells to cut it out, does not necessarily work. If they then send a tell, I would politely decline. If they get any more aggressive than that, it might require an /ignore.
If you DO want to join a kin, responding to cold-invites may not be the best option, but far be it from me to dissuade you.
[COLOR=#ffff00]''[I]A man[/I] of rare [I]perception[/I]. In fact [he] had such rare [I]perceptions[/I] they amounted to hallucinations.'' [I]Walt Kelly
Dottiel,[/COLOR][COLOR=#faebd7] Kinship(s): [/COLOR][COLOR=#00ff00]There is no Fifth Star[/COLOR][COLOR=#faebd7] (Meneldor)[/COLOR]; [COLOR=#00ff00]Fifth Star Vagabonds[/COLOR][COLOR=#faebd7] (Riddermark)[/COLOR]