i play with voice and subtitles, but if its particularly pointless, i skip it when im finished reading. i am used to the mostly text-driven RPGs of yesteryear, so i like to get through the dialogue at my own pace.
but, you do have a point about the massive resources that go into voiced dialogue not really showing. text-conversations allowed for more dialogue at a quicker pace, more responses, and overall more depth to the story with the ability to just gloss over if you were tired of reading. i much preferred the silent warden in DAO over hawke's pathetic attempts at sarcasm, and would argue that non-voiced dialogue are far from universally obsolete to voiced ones. IMO, given how dialogue-heavy bioware games are, voice-acting EVERYTHING just takes away far more money that is better spent elsewhere. in their old games like baldur's gate, the opening line being spoken was all you needed to get the character's voice and tone and then read the rest in said voice and tone; all that money that wouldve been soaked up by voice-acting the rest of the dialogue could be spent making the rest of the AMAZING game.