Let's assume your goal is to be in the elimination matches.
There are three ways to get there. 1) Win enough matches so your ranking makes you an alliance captain. 2) Perform well enough on the field so your performance makes you an attractive second pick. Second picks usually are decent "primary" scorers. 3) Become a third pick due to your outstanding secondary characteristics. In this year's game, this is probably going to be ability to balance and ability to play effective defense against fender bots.
Notice that marketing has almost nothing to do with the first two ways of getting to the elims. It is all about performance on the field. When you are marketing your robot, you are primarily trying to effect the possibility of your team being a third pick.
To do effective marketing, you need clearly identify your target market, and you need to effectively communicate the right message. In this case, your target market is/are the decision makers on the two better teams who have the power to decide to pick you. Since you cannot know ahead of time exactly which teams these will be, market to all the teams. I saw this mentioned in just one other post, but it bears repeating: Be sure you are directing your communications to the right person or persons. The people who are going to be making the pick lists are probably not in the pits. They are in the stands doing scouting. If you are trying to sell your team, and are walking from pit to pit doing so, your first question should be, "Can I speak with a member of your scouting team?" If there is no one in the pit from scouting, ask for a name, and go find that person in the stands. Communicating the right message to the wrong person is not effective marketing.
Next, you need to communicate the right message. Remember who your target market is. You are not trying to sell your "primary" scoring ability. If you were a steller scorer, you would be one of the two teams doing the picking, not one of the many hoping to be picked. Your performance on the field would have achieved this already. Rather, emphasize the qualities that will distinguish you from the rest of the mid-pack robots.
The most effective marketing strategy I can think of would be to track down the mentor and student in charge of making the pick list for each team. Place in their hands a flyer. The most important thing on the flyer is a huge picture of your robot, so they will see it and remember to watch for it on the field. Under that, list the qualities that make you an attractive third pick.
Just for the fun of it, here is a flier for our team. (Look for us at the North Carolina Regional.)
https://lh5.googleusercontent.com/-y...%2520flier.gif