I personally love teasers. Teasers should have a definition to them somewhat though. They should be related to something you are using on your robot. They don't have to be a completed assembly or an almost complete robot, they could just be something as simple and meshed gears or a metal assembly. I do agree that random pics of off the shelf sprockets do get to be annoying. Basically, I love teasers, I want to see more this year, maybe a limit per team is needed, but I definitely want to see teasers again!
This is just my $.02.