Why so few extended length player's racquets?

djnemo

Rookie
With nearly half of the pro's using extended length racquets, you would think there would be more available to buy. However, Babolat seems like the only company to offer multiple models. Other than Babolat, if you want a racquet that is extended length and more than 11 oz, there are very few - 7G, prince OG 28'', a technifibre.

Why do you think so few models are produced?
 
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