But you admitted to playing the game in voice chat all the time
I might have worded it badly, but I meant I very occasionally play it in one, like maybe 1/30 of my sessions have me in one. I have played this game for hundreds of hours since version 0.6.1 and loved every second of it, most of the time without having any contact with anyone else, so it's not like that is what is keeping me attached.
I don't even really want multiplayer for the game, nor would I ever want the devs to do it if they didn't want to, I would just be fine with it's addition if it was ever added. I would still primarily play singleplayer, but if a friend was up to it, I would definitely play multiplayer for a bit.