Asking for "buy-in" to your latest initiative will get you passive indifference at best. Maybe indifference is what you're looking for - light years improvement from outward dissatisfaction or hostility. But if what you really want is to motivate stakeholders (senior management, administrators, researchers, faculty or staff) to your idea, buy-in often only produces a willingness to not go against the initiative. Most likely you're looking for champions or enthusiastic support. Saying to a group "we're looking for your buy-in" communicates you want to inform, not involve. The way to get enthusiastic support is if you bring them into the circle by asking for help, feedback, ideas and participation. Yes, some stakeholders may ask difficult questions. But don't fool yourself into thinking that by keeping them at arm's length with periodic updates that you've got their support.
Too often the bar is set too low around what we can ask or expect of others. For a group to be jazzed about an idea, you've got to get them involved in the change, not just inform them what's coming.