I would caution against assuming that anything related to commissions is actually customary, including an even split. All of this really is negotiable, and when I think about the past year, I've seen multiple occasions where different splits were offered. For example - I referred some business to an agent in Tennessee, who in order to pay my referral* convinced seller to offer a lesser split to the buyer's agent. I know of at least one agent in my market who does similar. I know of another agent who charges at least 10% on any land deal, while others are flat-fee.

* If I were a member of the public, I'd be more upset about referral fees than commissions. This is a far more grey / nebulous area of real estate compensation. We have to disclose and discuss commissions up front, but referral fees are often in the shadows and definitely can cause buyers / sellers to pay more.