If it took Google a whole year to roll out more video ad format sizes, does that mean they work, or not? I would guess not… but then, why roll out new ad format sizes at all?
Google uses either a CPM payment model (where the site owner gets paid per thousand impressions of the static video graphic) or a cost per click model (where the site owner gets paid per clickthrough to the advertisers site. Note, the first click on the video merely acts to start the video… site owners get nothing for that click. Only a subsequent click which takes the visitor to the advertiser’s site earns the site owner money) depending on which way the advertiser has decided to pay for their ads.
Have you opted in to “image” ads… have they increased your earnings?