from the Wikipedia link I posted earlier...
"Capitalization rates are an indirect measure of how fast an investment will pay for itself in net cash flows; each year, the percentage amount of the cap rate will be repaid. In the example above, the purchased building will be fully capitalized (pay for itself) after ten years (100% divided by 10%). If the capitalization rate were 5%, the payback period would be twenty years."
I know nothing about finance, but this suggests that it is desireable to have a high cap rate since the acquisition would pay for itself much faster.
I sort of see this as being similar to determining the "payback" period for a capital improvement. The shorter the payback period, the more sense it makes to move forward. If the payback period on something is 20 years, chances are that neither the improvement nor I will be around that long. If I can recover the cost of a new "high efficiency" boiler in 3 years, then that may be a sensible purchase.
If the car wash as I am considering purchasing, generates enough profit to pay for itself it 10 years, and I can wait that long before needing the extra profit that is going into paying for the purchase, then that is a positive thing. If it will be 20 years before I get any of that profit, that's a bad thing (for me personally).