The little LBS near me ( who made fun of me for not having a rear brake on a fixed gear, this from a guy who has been riding fixed for 30 years) has a few superbe pro track cogs for $15 each. Are they worth it? Should i buy them all and ebay them? It seems cheap if they are decent cogs. I figure he's had them under the counter for at least 10 years and never changed the price.