Or worse, leave the house abandoned which would attract far worse energy.

Not being able to sell all your power produces reduces returns.

The rental income is not a lot but since I can deduct a bunch of things including depreciation on my tax returns, I will also have savings from reduced tax liability. 

As a mom of 3 boys, I love to see young people tackling their future with energy and vision.

We generate enough revenue that we can handle this expense but it would sure be nice to reduce these expenses.

My preference is to reduce the amount paid up front in both fees and downpayment.

If anything, it reduces your risk because it prevents prices to drop sharply like they do in the US when people can't service their mortgages and have to sell.The downpayment and the interest rates are actually very low for Mexico.

This Contract Addendum states that if the appraised value is lower than the offer price, the seller will reduce the price to the appraised value OR the contract will be cancelled and your escrow returned to you. 

This significantly reduces my out put and I would love to find an alternative. 

The quality of agents runs the gamut, but I bet you don't ask the attorney to represent you and tell them I won't pay you until I am sure you win the case (obviously some do work that way but talking about the situations where that is not the case).That being said, if you ask someone to run around and do a bunch of "free" work eventually that tapers off as they find clients that respect their time, energy, resources (assuming they are worth their weight).