Hey Mert,
An agent can do all that with VA's (Virtual Assistant)which will give the agent more control more money and more tax write offs.
The days of agents being successfully with only big brokerages are gone. Everything a brokerage can do can be done online with VA's and outsourcing. Which hits on my original post about the internet changing the way real estate is practiced. A single agent or a single Broker can have all the extras that many of the old guard power houses had and have.