Originally Posted by Caitlenren

So, the best strategy - to bet equal amount on every boat?

It depends of what you want. If you aim for a fixed revenue, you can do this:

odds	bet
100x	3*n
50x	6*n
30x	10*n
20x	15*n
10x	30*n

So, you'll always get a revenue of 300*n (n, whatever integer multiplier). And you'll spend 64*n tropical cocktails.