Who positions their speakers straight ahead (zero tow in) and why.

Speaker toe-in is room and speaker dependent.  Vivid recommends toe in with beams crossed just in front of your head in your seated listening position.  I gradually toed out until I achieved the best balance between frequency response and staging/imaging.  The beam crosses behind my head.  If I approximate angle, towed in is 15-20 degrees.  My listening room is my living room in my small house, so I am limited and from a room perspective. I rate the room poor; but it’s the best I can do.  No toe-in reduces image density and affects frequency response in my room with my speakers.  

Kind of related to this is that we sometimes focus too much on getting rid of all reflections around the speaker when in fact there is an ideal balance between a given speaker's output pattern and how good the side and rear reflections sound. 

Small space + wide speaker may force you to toe in more than in another location.

Weird, also have Forte's, 10ft apart, 10in off the wall, each toed in 2in off the wall. I sit 8ft away.  Good soundstage, good depth, feels like my stereo cabinet (sitting between the speakers) is talking to me. 

Used to have them 20in off the wall, 6in of toe. Found that I was missing most of my bass, the image was a little narrow and forced. With a small soundstage. 

During Christmas break, spent almost an entire day moving my speakers around. At the end of the day, this is what works for me. 

Dali recommended straight ahead for my Epicon 8 speakers, and I essentially preferred that. My PS Audio FR20 speakers came with very specific toe in recommendations and I also prefer them essentially with that toe in...

It depends on room boundaries and distance from the speakers. After that it comes down to preference and maybe hearing in the end. Upbringing after that.