Dbods,
Okay, let me give you two scenarios -- one is yours where a GM tanks to get a chance at TD (wow, that's kind like what the real Spurs did, huh?). So how much fun is the year of fantasy basketball for him? The second scenario is where a GM is doing poorly (and this DID happen this year) because he has second rate starters (mainly because of the position he was in the draft this year). That GM, if he is stuck longterm, might lose interest in our league -- I'm much more concerned about the guys on the bottom losing interest longterm than I am about someone tanking the season just to get a better draft slot.
There are going to be enough guys available -- if someone wants to tank the season to get a shot at TD or KG then he's robbing himself more than he is robbing us -- just my opinion.
Of course, there are going to be people tanking the season every year -- Ted and WOW are great examples of that!