I usually just say: "Thanks, but I'm insanely happy where I am right now. Check back in a year if you want to." This gets a polite "Okay, I'll contact you nex

I usually just say: "Thanks, but I'm insanely happy where I am right now. Check back in a year if you want to." This gets a polite "Okay, I'll contact you next year," and often they do.