It depends on what kind of intermediary company you choose.

Some intermediary companies are very shady. Last year, I bought a house from Tianjiao Real Estate Company in Xiling District, Yichang City, and was defrauded of about 7,000 yuan. Tianjiao mainly uses your unfamiliarity with the real estate system to deceive you. They will ask you for additional fees in the form of stamp duty, bank loan fees, etc. In fact, stamp duty was banned by the country as early as 2009. Loan fees are even more of a gray income.