6% is typical in the US (3% for seller's agent, another 3% for buyers agent).
6% of $500k is $30k. $419k is the median sale price in the US according to Redfin.
It's possible to negotiate the percent down, but typically that is only common on particularly expensive listings (not super common below 7-figures).
I purchased a house in New York last year. I found it on Zillow and showed up and bought it without an agent. They still charged the seller 6% (the seller agent got double the commission because I didn't have an agent, and they made themselves my agent of record for the purpose of the transaction - interestingly this is legal in NY, but not legal in all states). And because the seller agent knew they were getting double commission if they sold to me, they did a good job fending away other potential buyers (which I'm not complaining about as a buyer, but would be pissed about if I were the seller).
There are lots of reasons to ditch real estate agents. They charge way too much relative to the value they bring most transactions.