Thats because the talent pool of Gi competitors is HUGE compaired to the pool of no-gi competitors.
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Look at Mark Kerr, never touched a gi, won three ADCC titles, against guys who trained their whole lives in the Gi. It is a moot argument. Plenty of guys have done it. Jeff Monson tore shit up in No-Gi comp and he barely wore Gi.
There is alot of very talented Luta Livre guys in Brazil that have been training No Gi there whole life, but because of the Gracies success in bringing Jiu Jitsu to the U.S, Luta Livre has had a hard time getting here.
Now that No Gi is gaining popularity, you will start to see more Luta Livre finding its way to the U.S.
In Brazil they usually run separate tournaments, however at this Jiu Jitsu No Gi tournament, they invited Luta Livre guys and the Jiu Jitsu guys got smashed. http://www.rionalmeida.com/gi-vs-no-gi/