Seconded... but you also need the rest of it. I'm making a lot of money, doing work that helps people, in a (mostly) sane environment, with really good co-workers. Yes, I'm kind of bored, so I could be talked into leaving. Not for less money, though. And not for a garbage working environment, or for co-workers who are jerks, or for management that is insane.

Yeah, there are some things that are kind of the "cost of entry" like decent work conditions, etc. But once you meet that minimum bar, I think more money is the easiest way to lure most people. Now there will always be some people who can be lured away by something else... one good possibility would be offering a private office instead of open plan. Hell, I'd probably take less money just to have a private office. But I doubt everybody feels as strongly about that as I do.