However, I'd really like for you to use standard football lines (you don't have to offer the full extent that betfair offers, but standard FT 1x2 lines are a must, these "to qualify" lines are rarely relevant throughout the season) and also use the standard terminology (back, lay, outcomes labeled by team names or 1x2 rather than "yes/no"). In the future, you could perhaps have a sports section that makes it simpler to bet on sports rather than the "catch-all" interface you have now.
Additionally I'd like to be able to see how much is matched/unmatched on each different outcome at each different odds, betfair style, and not just in total.
Thanks for your suggestions. Your impression is right - our interface was not designed for people who do sport betting all day. In user test we found out that new people are really confused of for example lay odds of 4. What they wanted to know is what odds they get (1.333) and not what they give the other site.
Another example is, that "normal" people are confused if they bet on "Germany will win" and then we say them - your bet did not win because Germany did not win after 90 minutes.
So - in our opinion - for sport books pros it is way easier to figure out how our site works then the other way round for newcomers.
The way we want to attract the pros is purely by exceptional odds and low fees.
However, we are always willing to add features. We already implemented the feature you suggested regarding the overview of all open bets on our testserver: http://188.165.246.217/predict/registered/new/brazil-will-win-the-football-world-cup/
and then click on: "show additional stats" We will deploy it on the real server soon.
I just hope that as next season approaches sportsbook functionality gets worked on.