Saws, and other required building supplies should be the rewards for Regattas. Seriously. Make it worth our while to do Regattas!

Pro: it'll give us incintive to do Regattas.
Pro: we will have another way to get building supplies, other than trains, which never deliver what we need. (Btw, fix that)
Pro: it's better than current rewards, which everyone agrees are lame (I can just buy them at the market for a few coins)
Pro: it'll keep players from losing interest in the game because they can't advance (can't build anything)
Pro: (and I put this on the bottom line, because it really IS the bottom line...) it'll make YOU more Money because people will stay with your game and spend their money because they're happy, rather than leaving out of frustration and going to your competitor.