Why companies on the wall street are always looking for capital to use for trading? It is the same logic.
While a Wall Street company is registered and basically cannot easily run away with your money, an unknown user on the internet, claiming this or that can.
While a Wall Street company is known for this job and has trained personnel doing it, an unknown user on the internet, claiming this or that has to prove himself big time.
So no, it's a bit more complicated than being "same logic".
No, it is same logic as an answer to your question. Investing or not money into this guy is a different story, a different subject. But asking someone what they need capital instead of just using their own funds, goes against the profile of a proffesional trader.