the reason there are only TEC pirates is because the Adv and Vas are invading TEC space.  They are just making their presence known and so there has been no time for pirates of their factions to flourish. 

Plus Stardock never put them into the game.

Some popular mods have handled this by making certain planet types have different races by the neutral controlling faction. A couple examples being the Vasari holding neutral volcanics and the Advent holding neutral ice planets. When the game is finally released you can expect a lot of those mods from trinity to be ported and expanded into rebellion.

they have several very important new planet types.  The dyson spheres are very very useful.  I can fit 18 trade ports at one and get about 300 creds a second in no time

I'm afraid professional multi posters don't get paid very well, even in karma.

i do get 10000 troll faces a year though...