I'm going to be voting yes to the referendum on AV not just because all the kool kidz are doing it for the simple reason that a system where the only party on the right that can plausibly win seats- The Conservative Party- is a highly centralised institution that can easily marginalise any views unpopular with the ruling clique is not a desirable situation.
As it is, my only plausible option in a competitive election is to vote Conservative because- despite all their flaws- I find them far preferable to Labour and the Liberal Democrats. Consequently they have zero incentive to care about my opinions.
There is a bit more of an option at the voting booth for those on the left where there are a grand total of two parties- one of which is in coalition with the Conservatives. The general principle is the same though- more options will prevent the Labour party taking left wing voters for granted.
I've also been rather appalled at the tactics of the NO2AV camp which has scaremongered shamelessly (the infamous baby ad springs to mind) and punishing them would be satisfying.