Ethereum plans to move to the Casper proof of stake algorithm in a future version of the network. However, as nodes are betting on which block will be produced next, does that mean (as a node) you can manually choose to bet on which block is produced next.
If true, someone with large amounts of ether could theoretically choose a block which hasn't been bet on, and bet more than what is betted on the block the majority consensus is betting on. This way, the person with large amounts of ether could manipulate the network to work for him/her self.