Who cares if he was one of the "quickest" players in NBA history? He isn't any more, and that's a big reason why his play fell off (that and his ego). He wasn't much of an asset in 08-09 or 09-10.
The jersey sales argument is moot too: the money generated from jersey sales is evenly distributed among the league, with a small portion going to players. Iverson's team doesn't get all the money for Iverson's jersey sales. Financially, unless it boosts attendance, it's not gonna make a damn difference.