Picked up 2 possible bugs
and a few other issues that you may want to have a look at and address in need.
High Unregistered users can add comments to the Blog. To prevent spam, recommend that only users who have logged on can post comments. Users not logged in can only view.
High You can purchase fractions of shares. Bought 0.5 and 0.0111 of a share
Low You cannot see what shares the other players hold. Not sure if you want to keep the selections confidential, but it would be great to see what others are holding (i.e. Where did the leader get it right...)
Medium Previous winners not provided for. You should have a tab to view previous years winners/runner ups/etc.
Nice to have Leaderboard to show % Growth. I believe it would be a good idea to show the % growth of the portfolio on the leaderboard.
Nice to have "Out of style" screen shows once you have purchased shares. The screen provided (for a few seconds) after your purchase of shares is not in the same style as the rest of the site. It's just a white screen displaying "Saved" in the top left corner. If on a slow connection the user may think a problem is evident. Would be better if the screen either did not display during the "write" process, or displays with the same CSS as the rest of the site.
Nice to have No Lines between holdings. It would be advisable to have lines seperating each row in the holdings, especially if one has multiple shares.