But this post from the fine gentleman at Net Density made the reasoning clear.
advantage to these programs is that the assessment stays with the property, not the individual, so homeowners do not have to assume they will live in one place for 20 years to see the benefits of a renewable energy system
For most places in the United States, it doesn't make sense to add solar panels to your home--it takes too long to recoup the investment. Americans move too often. But PACE programs provide a way around that.
But are the solar panels a real selling point? I would say 'yes', if only by providing documentation on energy saved. There is a big difference between the claim that 'solar panels will save you money' and being able to document 'my total utilities run $45 a month'.