"Schmoozing" (selling yourself to anybody in the top 8) can pay off. However, bad times to do this are: a) they are swarming their robot like crazy, b) they are about to play a match, or c) when the judges or a bunch of other teams are there. Start on Friday and step it up as you get closer. Don't be too agressive about it though; that gets the "pushy salesman" reaction. (On the other hand, don't ignore the top 8. That could be suicide.)
By the way, reason d) that this team didn't get picked is: they didn't draw the attention of enough scouts. Reason e) is: alliance strategy may not have had a place for the robot type. (eg. a ringer robot when the next few picks want a ramp bot) I say, let it fly, sell yourself next time around, and hope it works. (Giveaways help too.

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Past teams:
2003-2007: FRC0330 BeachBots
2008: FRC1135 Shmoebotics
2012: FRC4046 Schroedinger's Dragons
"Rockets are tricky..."--Elon Musk
