In the UK your estate agent (seller's agent) usually takes 1-2%, and there are cheaper ways to do it like self-listing. You then get a conveyancer (a lawyer) on each side to actually do the work, and they usually work for a fixed fee.
6% is huge.
You can list your home and refuse to pay buyers' agents, but it generally takes much longer to sell a home that way. Not uncommon for a home for sale by owner to later be listed by a realtor when the owner loses patience. As you can read elsewhere in this discussion, real estate agents hate homes for sale by owners because those people generally don't want to pay their commission.
Unfortunately, they don't get money if they don't sell, even if they spend hours helping a customer. IMHO, this is bad. A buyer will pay for all the deals that weren't closed.
UK estate agents do the absolute bare minimum and often less. When it comes to viewings they really are just key holders and nothing else.
Still, 6% is huge