If you like the tone you're getting from an unported kick, then by all means leave it unported. While I'm VERY pro-sound tech, it's sort of their job to mic your kit and make it sound as good as possible in the house. They have to deal with a variety of guitar amps, guitars, noisy pedals, bass rigs, keyboards, etc., why is the kick such a big deal to EQ, compress, etc.? It's their job.
With that said, I always mic my kick drum at every gig. In addition, I always bury the beater like an unrefined Neanderthal. Because of these things, I always port my front head. However, some of the absolute best kick drum sounds I've ever heard on YouTube were from unported kicks.
Throw on your best ear-goggles and listen to this. It's perfect.