My experience is investment bankers and interior designers have the same attitudes of superiority. The goal is to make you feel like you can't do it yourself and you need their help and that they are being generous in providing it. It's a tactic to sell a service that doesn't really exist.
I get what you're trying to say but ibankers have the establishment behind them. They may have huge egos and play 'hard to get', but behind them is the firm who has capital and the rollodex to call ppl to make things happen. So in some ways they are your door to financing your company.
As for interior designers, yeah I guess. I'd say they are more of: if you don't have the time to do it yourself shopping around, then you'd hire one of them and pay them to help you figure it out so you don't have to. Like breakfast. Sunny side up, fried ham and toast with butter. Anyone can do this stuff at home and the quality will match the best places. Yet people pay for it. Some are just lazy. They wake up, shower, get changed and want to eat without doing the work cooking.

