A buyer's agent is your fiduciary.If a listing is already in MLS, the entire commission is already agreed to in writing. 

Plus I can look at houses whenever I want and save a couple thousand on commission.

With commercial land brokers commission agreements typically run about 8 to 10% total depending on the project size.    

If I'm paying the first 6% for commission, will I walk away with most of what remains?

Not a ding against all agents, but in the end they are salespeople working on commission. 

His son is now on the city commission.

Next house you buy for yourself, represent yourself and put the commission into your pocket.

@Ayala Shoshan  If you use a knowledgeable agent and wind up buying through them, they'll typically get a commission that's paid by the Seller and you get the benefit of learning from their experience.

Am I better off submitting my offer to the listing agent so they get full commission instead of using my wonderful hard working agent?

These cost more than the standard deadbolts, but probably no worse than the whole LLL deadbolt initially costs.I should get a commission for referring their locks, haha.