Other posts are not sticky so they fall down with age. Stickys are sticky so they stay at the top. Typically a sticky is a post that is important to the group. On this site i would expect to see stickies on the following subjects: "Use the search feature before asking noob questions", "Clubmans/ClipOns", "Carb Tuning", "Pics of your Bike", "Names to faces", "Benefits of being overweight", etc.
no no no, it's all threads started by ROSKO become sticky's for being so useful!
really,they should answer the questions that come up again and again, like FCB tech questions. The vintage racing section is awesome having the 'in action' photos there. Here's a couple more ideas I would like to see: a 'finished projects' sticky in the projects section, a 'classifieds rules' one in the for sale section, 'how to start vintage racing' in vintage racing, and I think all posts in 'member products should be sticky and open only to members with a certain post count to keep out spammers and folks who do not contribute.