BetFair seem to be stuck with the betting approach, as far as I can see. The prediction market approach would require that you present to the public (as opposed to the small population of bettors) the probabilities expressed in percentage. (Odds can be added, of course.) Instead, BetFair insist on decimal odds only (with, sometimes, when the mouse cursor hovers, their equivalent fractitional odds). And, if you want a chart, the only thing you can do is praying for it. As for chart widgets that can go into feeds (a la InTrade, NewsFutures and Hubdub) just forget about it.
BetFair pretend to be taking the prediction market movement seriously, but the facts speak a very different picture —they don’t have the first clue, and they just don’t want to learn.
