They’re a good snack or meal. Tortilla chips with melted cheddar/monterey jack, pickled jalapenos, salsa, refried beans, red onion, lime, cilantro, olives, sour cream, and guacamole. I even sometimes add some vegetarian crumbles that have been seasoned with taco seasoning (like a chili) for a more protein-packed meal.
Some do. And usually the cheese harden in 60 seconds and tastes like plastic. I’ve never tried the non-kosher kind, but it looks a lot better with meat.
Because nachos are exactly the sort of thing pizza stores do sell. But for some reason they usually don’t sell them anyway. The real question is why all kosher pizza stores sell french fries, and Jewish customer expect them to, when (I’m told) treife pizza stores never sell them, and it wouldn’t occur to anyone to order them there.