AKA: Wait at the Altar
You make / force your counter-party to make the first offer. The disadvantage is that he now has the opportunity to anchor the discussion around his high value opening position. The advantage is that you now have his opening position on which to base your negotiation. You are getting information, but not without cost. Once he anchors the tendency is for you to accept his proposal as the benchmark. You are giving up power.
Intent: Gain information; force him to commit to a value range.