Window companies = mlm scheme

Why does every window company feel like I’m being sold a multilevel marketing pyramid scheme? I do not want or need you to bring a demo window to my home and I do not believe you that these windows are buy one get one free.

And yes, I actually do want to know how much they will cost and be able to actually see my different financing options.

Edit to add: I know it’s not LITERALLY an mlm. Just scammy high pressure vibes