The arguments against the 2% rule are that there are better strategies to take other than insisting on getting to this number in cashflow.

If it went any higher the argument for renting would become even stronger.The opportunity cost of tying up all that cash, time & energy is almost never worth it.One of the only times it makes since to finance your primary residence is when you know you are buying a property substantially under market, and reselling it.

What incentive would make you, as a buyer's agent go back to the seller's agent during negotiations and initiate a tactful argument that the buyer's offer is fair value for the property and he should sell it at that price point?

My counter argument would be that many people have limited capital to invest with so if they decide to deploy capital, they want to ensure that it will be as much of a "homerun" as possible. 

The argument is that you will overpay for a $10k MH if you value it like the land.  

I think it is more important to do things formal and according to custom when a family member is involved.  

Essentially we go through the design process with customers and come up with plans that fit their needs.

I've been building custom homes for the last 5 years.

I feel like all they do is regurgitate the same information to every customer.

Since I'm the paying customer, I say put up or shut up.