The contract Brad Stevens signed last year was an undisclosed amount per year (north of 1mm per year) through 2022. After the season, it will be further augmented (creatively, but certainly probably a per year increase and more years)
He has, effectively, a life time contract
If a program isnt one of the top 2 or 3 in the country and (probably) located in the Midwest, you may as well pursue Coach K. Its just not happening.
With as much money as he makes (for as long), in his hometown, for a program that can win at the absolute highest level, its simply one of the better jobs in America.
As far as recruiting goes, Butler sort of gets who it targets. On the occasions it has bumped up against Purdue and IU, its been a bit of a 50/50 proposition in recent years (Gordon Hayward, Matt Howard, for example). I cant recall ever going against Notre Dame, accept in talking to Scott Martin after he decided to transfer. ND mostly recruits east coast kids. I believe they have only one Indiana kid on their roster. Butler averages 1 to 2 Top 150 recruits per year and I dont really see any reason why that wouldnt be the baseline assumption going forward, with a likely bias significantly improved.