@Reese Thompson,
1. "Just because it's the majority of the way things are done doesn't mean it has to be done that way." True. But people's expectations are normally founded on what happens most of the time. Most of the time, when a buyer makes an offer on a house, the seller does not counter with a price over the advertised price because brokerage services are involved. Most people expect sellers to have set a price that covers normal costs of the transaction. Your cousin is attempting to do something that is encountered a minority of times. He should not be surprised when it doesn't happen the way he expects it to.
2. "If the seller doesn't want to pay for having agent representation, he shouldn't have to pay for it." True, again. No one here is saying that your cousin, as the seller, _has to_ have or pay for sell-side brokerage. The majority of the comments have been that a seller who opts out of sell-side brokerage is implicitly or explicitly accepting frustration in lieu of cash payment. Most of the posters have given the opinion that this is a bad trade-off. My point was that the seller should not begrudge the buyers having representation. There are two sides to the transaction, each of which has potential pitfalls that real estate licensees are paid to help avoid. Each side is distinct. At issue in this thread is buyer representation.
3. "If the buyers are wanting it, then they should pay for it, not the sellers." The buyers are the ones bringing the funds to the table, so they, in fact, would be the ones "paying for it." As an example, the buyer brings the funds that are used to pay off the seller's loan. Very rarely do sellers bring funds to the table; all of the money changing hands originates with the buyers. The point here is that your cousin did not anticipate this cost and price it into the deal. (If he had a seller's broker, that broker would have told him this. By not paying a sell-side commission, he chose to pay with time and frustration instead.) If a buy-side commission were priced into the deal, the buyers would have paid it as part of the agreed price, probably without batting an eye. Yes, the money would pass through the seller's hands, metaphorically speaking, but the funds would not originate with the seller.
In your reply to @tim puffer, you assert that "buying/selling a property is not rocket science." Also true. It is a complex legal transaction that normally involves significant emotional and financial risk and is heavily regulated by state and federal governments. Complex things normally attract specialists. Real estate is no different.
You said "involving agents increases expenses to buyers and sellers." Not true. Involving real estate professionals allows the buyer and the seller to obtain brokerage services that are denominated in cash versus time, effort, and frustration. Transactions without real estate professionals are not inherently better transactions that do not impose transaction costs on the participants. They are not like LED light bulbs that generate light without heat. They simply do not have dollar amounts associated with those costs.
You said "That's why many of the investors who've done well have gotten their agent's license so that they can reduce that expense on something that anyone can do." Investors who become real estate licensees incur costs. They incur the cost of licensure and MLS membership, at a minimum (which cost considerably more than you probably think that they do). Again, obtaining a license to eliminate case-by-case, sell-side commission costs is simply a transfer of the cost from per-transaction, cash payments to ongoing payments of time, effort, and, yes, cash. It would be interesting to see the balance sheet over time. They probably do come out ahead, eventually. But the cost is still there. Investors who obtain real estate licenses should probably not attempt to handle both sides of transactions in which they have a financial interest as the seller. Most states require disclosure of licensure status when a licensee is a party to a transaction. Done correctly, these investor/licensees price buyer representation into their asking prices.
BTW: Anyone can do rocket science as well. With a real estate professional, at least you are assured of some level of instruction in the subject matter and a license (which exists to protect consumers).
And if you can find a lazy appraiser in the era of TRID, take a picture, as that is an endangered species nearing extinction.