Gresham Search interview questions

I went through a 3 part application process. Telephone interview with a HR member , first round interview with a senior consultant/partner, and then final round interview with the boss. Telephone interview was fairly straight forward. The person on the phone was nice asking general questions i.e. why do you want this job, what skills do you provide etc. However when I asked at the end "if there was training given for the job", I was informed "no" because everything was fairly straightforward. Regardless, I passed that stage no problem. Second round interview with a senior consultant was done in person at their office in Moorgate. Not gonna lie, office was amazing. Really snazzy and at the heart of London. The senior consultant was really nice. He seemed genuinely interested about my background and when he asked follow up questions it was to explore my answers in depth which was fine. Questions like "give me an example of where you were able to solve a problem" etc. I left the interview re-affirmed that this job looked really good. HOWEVER... The final interview with the boss was an absolute joke and I am happy to let anyone know of what happens and my thoughts of the company. Firstly, the boss is incredibly arrogant and up himself. When I talked about why I was motivated about making money, not only would he constantly cut me off but would talk about how great his life was i.e. I have a dream house in Islington and a flat I am renting in London. Next, unlike the previous interview who allowed me to expand my answers and seemed genuinely interested, the boss was completely the opposite. He would be incredibly patronizing and rude. Example. When he bragged on about his life and how he was smart, I tried to say something similar by explaining how "everyone in my family went to uni". Instantly he drew out a straw-man argument by suggesting that "does going to uni then make you smart". I said "not necessarily" but "it allows me to have intellectual discussions with my family members". And he then follows up with "So you're all smart and everyone else is not?" What is he on? I never said that at all. Regardless, the interview went on with him giving you problem solving scenarios which he expected you to know and his demeanor was awful as he'd just stare you down like 'how stupid are you hurry up'. To end the interview I wanted to confirm "what the base salary was" as on the advert it says £30k. His response was "I think its £23k but I think that's too much. I want to reduce that but increase the commission". His thought process being that by increasing the commission, staff will be motivated to hit targets. IMHO, reducing the base salary will not only deter people from joining the company but when they realize the dullness of the job, they will leave much quicker as they have poor salary for high demanding work. I can't stop anyone from joining that company. If you want an arrogant boss and surrounded by people who seem like they don't want to be there for pay which is going down (not up) then be my guest. I personally think that you'd be wasting your time and your money because they do not reimburse travel fees. IMHO, apply elsewhere as I genuinely believe if the boss wants the company to grow he needs to realize A) He is most likely the problem for poor staff retention, B) Pay is awful for the high demanding work given.