Time on the ball is certainly a big key. I don't see him racking up a ton of multi-assist games throughout the year, but you can see quite easily that he does all of the little things exceptionally well. Those little things go a long way towards elevating the level of your midfield play.
As far as "to the tune of 30 mil"...it's just the state of affairs nowadays it seems. Young, high-quality, entering his prime. See: Lallana, Adam.