I bought a home recently and work in the mortgage industry. My opinion: the buyer's agent should be a flat negotiated fee, maybe an hourly rate. There is very little that most do that the buyer can't do themselves. If the buyer doesn't want to do it themselves, then that's a choice they make to pay, and for items like inspection reviewing and negotiating, I'm not sure I see why it's significantly different if I'm buying a $200k house vs an $800k house. I don't agree with their fees being a percentage of the home prices.
Seller's agents on the other hand...those guys are salesmen. I can see way more value in incentivizing that person to get maximum value for me.