I don’t believe a healthy vegan diet is more expensive than an omnivorous diet. That said, junk food is pricey, whether or not it’s vegan. Be smart about your health and be smart in the grocery store.
Any set of “food rules” can result in poor health and a strained budget. The point is to only set “rules” that are realistic and that fit your lifestyle and personal belief system.
Yeah, vegans can be incredibly pretentious and classist. Anyone can. What else is new?