I have a theory about experience that I am going to be kind enough to share with you without charge. It's pretty elaborate, based on lots of speculation, and thus could be wildly wrong. With that caveat, here goes:
I think of a given player's performance as being a result of (a) his skills and (b) the intangibles. Within (b) I place Game Shape, Stamina, and Experience. The importance of Game Shape in defining a player's performance is obvious to any one who has been through a season or two of this game. I have recently (over the last couple of seasons) discovered the benefits of Stamina, which I understand as the ability to sustain peak performance in a game. In both of these cases, all skills are enhanced (from what I can tell) -- to put it more broadly, players "play better" (that is, no one skill works better, but I think they all do).
BuzzerBeater is a relatively young game -- we are only in season 12 -- and for that reason I think Experience is the least understood, least appreciated, and least exploited of the "intangibles". To make a cheap joke, we have no experience with Experience. My guess is the effect of Experience is similar to that of Game Shape and Stamina -- all skills are maximized with the most experienced. I expect that as our understanding of the game matures, more coaches will come to value a player with high Experience -- indeed, because it can not be "trained", it may prove to be more valuable than Stamina or Game Shape.
Implications? As with so much of this game, balance is important. Right now, coaches fall all over the 18-year old with great potential, but place no premium on the solid, experienced pro (judging from the Transfer List). I once thought 26-year olds were not worth the effort, but now I am guessing that a 26-year old with a decent skill set but much experience may be much more useful to my team than a comparably skilled 19-year old who demands a great deal of time and attention (training).
That said, an Experienced player is still limited by his skill set. I don't think a squad full of 27-year old inexpensive, but experienced, would be a wise way of building a winner. And LeBron at 20 is much better than Corey Maggette at 30, but Steve Nash young is not as good as Steve Nash experienced.