Michael, since the only issue you're addressing seems to be the "savings"... let's address that directly.
Yes, I'm sure the developer will give you a "discount" perhaps a couple thousand dollars off the list price, for being unrepresented and he doesn't have to pay a buyer's agent.
BUT, buyer's agents are far more familiar with the developers in the area. They know the weaknesses and strengths of the particular developer and the particular building. As an example, one of the developments in our area was known that they would STONEWALL on price. They wouldn't budge a dime, with or without an agent.
BUT, we agents knew, that the reason they didn't want to budge, was because they didn't want it to show on the tax records that they had discounted any units... 'cause that would anger other owners in the building, as well as affect future sales.
We agents knew, however, that they were MORE than willing to negotiate FREE upgrades... such as granite counters, upgraded appliances (stainless package), in-unit washer and dryer (the unit only came with a hook-up), and an extra free parking space... None of those things showed up on the tax record... and these savings represented more than $25,000... if you include the parking space.
So.. while you might save $2,000 - $3,000, the buyer's agent's expertise might save you dramatically MORE.
Don't be penny-wise and pound foolish.
There are plenty of other reasons to want a buyer's agent representing you... but that seems to be the one you're concerned with.