He's not the best in a 1v1 team. He has usefulness in GNW and Ranked teams where his mystery has the ability paralyze up to 9 people. Which is a tremendous advantage. Heck Gaara is one of my favorite ninjas hes prob not, well isnt the best way to spend money but I did everytime he was in the shop for 200ingote for 5(NO WORTH IT TO ANYONE BUT ME;I'd do the same thing for jiraiya frags)
But Point being if he's is someone you truly want go for it. However whenever we get updated shops sasori will be a part of it eventually. So to each there own.
And if a server begins to die they may merge a very small server? but don't hold me to that.