There is, btw, I think one huge variable that has not been brought up yet, and that's
playing style. I've always been kind of impressed at how different two winning players' EV / Showdown winnings graphs can look. For instance, consider these two graphs (that I just pulled off of Google Images) for 2 winnings players:
#1
#2
FWIW, the graphs each show a player winning between 15 and 19 cents / hand played, though I have no idea what stakes they play but that's irrelevant for this discussion. The point is that they can look so dramatically different. (My own chart looks much more like #1 above: I lose massive amounts in non-showdown pots, and win massive amounts in showdown pots, which makes sense, I suppose. I play very straight-forward (some would say boring) poker, trying to make my opponents make fundamental mistakes. I don't get carried away with fancy play syndrome.
Many 2+2'ers, however, seem somehow more impressed with graph #2, "marveling" that a player can be profitable in showdown AND non-showdown pots. He's seen as having a more complete / well-rounded game than player #1, completely ignoring the question of which player is more profitable.
Got a little sidetracked with the above, but the point is that I think the answer to this question is largely dependent on playing style. I answered NO because I feel like bet sizing is critical to my style of play (which, as described above looks much more like graph #1). Knowing that I can get a fish to come along with 2 naked overcards for, say, a 30% pot bet is important. Obviously that's just one scenario that I can exploit in only very few instances, but you get the idea. A winning Lagtard who sustains the same winrate, but does so via a steady diet of unchecked aggression, 3-barrel bluffs and so on may not derive as much of his winrate as do I from exploiting opponents via bet-sizing.
CLIFF'S: I think playing style is an important factor in answering this question, but which hasn't really been discussed yet. I think the answer could be quite different for a 37/31 aggrotard than it is for a 24/19 TAG with the same winrate.