I am just echoing what someone else said earlier but the problem with SB isn't that it isn't a good skill, it is that the salary formula punished you for having it.
Compate thses three players and tell me which you would rather have.
Player one
All secondaries respectable, all primaries (IS, ID, RE and SB) wondrous.
Salary $114,184.
Player two
All secondaries respectable, all primaries except SB (IS, ID and RE) wondrous, SB atrocious.
Salary $52,292.
Player three
All secondaries respectable, all primaries except SB (IS, ID and RE) prodigious, SB atrocious.
Salary $108,668.
I would think that player two was trivially worse than player one at less than half the cost. It's a no brainer. As for player three, wow, that would be a fantastic big man for the cost. I guess I would like better secondaries because of how cost effective they are but overall he would be brilliant.
Anyone want player #1?
I can give you prove of the other way around:
here is my PF
http://www.buzzerbeater.com/player/8050964/overview.aspx
i wont go into detail in terms of skills cause I know Soulhunter is crouching around somewhere. But he has pretty good SB, is the best Blocker of the league in the last 4 seasons. look at his ratings, usually the best in the league on season scale.
I know he can pretty much compete with the national PF, which he happened to play a couple of times during his career
http://www.buzzerbeater.com/player/6742609/overview.aspx
his salary is 160k higher than that of my player, the quality gap is fairly little. Although not knowing for sure, I suspect the quality of my player concerning the ratings due to a advantage in shotblocking.
There are other big men in my league with a comparable salary, but not with comparable ratings. this dude here is full 3,4 rating points behind while having the exact same salary:
http://www.buzzerbeater.com/player/9849010/overview.aspx
So, SB might not be something that pushes special stats enormously, but it pushes everything else and probably gives you a bonus on team defense, at least inside. But thats just my personal view.