I am biased (or the audience of this post, who knows) because neither I am nor a salesman or startups funder (not even american), but I really feels bad about t

I am biased (or the audience of this post, who knows) because neither I am nor a salesman or startups funder (not even american), but I really feels bad about the vendor when noticed that psychological tricks are used to convince me to buy something. Yes, I know that's how world works, but I am more keen to buy when I am sure and here is a room for valuable marketing.