THAT would be a reasonable processing fee. Make your basic fee cover your costs, instead of nickle-and-diming on top of a seller who's already shelling out 6%. (And no, it's not important how that 6% is being divided 4 ways)... the seller only knows that they're forking over 6% to sell their house, and now they're being asked to "add" $395.00 to it.
Buyers and Sellers of Real Estate never see the work done behind the scenes by Realtors/agents who are the coordinators between the lenders, title company, inspectors, other agent etc. We are involved continually from contract to closing with your lender, the title company, inspection reports, selling agent communication for negotiation with repairs, closing date changes and a whole list of different reasons that come up with each individual sale of a home. But it is not likely you would know all we do unless you yourself became a Realtor, anymore than you would know what a lawyer, underwriter or machine technician really does.
The Internet has helped everyone in the process see more of homes in the initial phases of the buying process, but Realtors still are showing just as many homes because nothing takes the place of experiencing a potential home in person.
You will have to be the judge of what is reasonable to you in the way of paying a processing fee. If you love your Realtor/agent and don't want to switch to another who doesn't charge, then you may feel it is worth the extra charge.
Always ask about the fees before using an agent - if they have one on top of the commission - go somewhere else. BTW, even the commissions are negotiable now.
With the advent of the internet, the legwork of the agents is substantially reduced. The days of printing and looking in the MLS book at tiny, often horrid pictures are over. So there is no longer any need to drive to 30 properties to find a nice one assuming the listing agent did a good job with pictures and descriptions.