Just to mirror what GC said, how do buyers treat ratios? In my market I had an old CCIM (who owns about 1/2 of the town as well). Tell me that he starts every deal with the rule of 1%, that the monthly rent is 1% of the market value of the property. Reflecting a Monthly GRM of 100. The more I thought about it the more it made sense (in terms of quick analysis) basically anything less usually meant that you were making a fairly good cash flow, but at an increased risk. Anything higher usually reflected a stable market with increasing values, but poor cash flows.
Now this is not a substitute for extracted rates or ratios, but it helps to explain where this stuff comes from in the marketplace.