Sales and re-sales within two years is always fishy. I always pay attention to past and pending sales of any kind for good reasons, those reasons are that the prior sales raise and answer a lot of questions. It might tell you something going on in the neighborhood. It might answer a question about some perceived factor about the property like functional obsolescence or location that is difficult or impossible to measure. It might reveal some hidden feature in the property. If I hired some one to do an appraisal for me and I saw that it was sold and re-sold within a two year period I would want to know why just on general principles. I certainly would consider two prior sales within a two-year period because that is a wealth of information. How long was it on the market, how did the sale price compare with the sale prices of comparable sales sold during the same period, etc.
The last run in I had with a client had to with the sale history of the property. This woman is one of those people that took the course on how to get rich in real estate by coning the appraiser. You know the routine, buy a property for $50,000, get it appraised for $100,000, get a 95% loan and use the equity to buy more properties under the same scenario. Happens all the time, right? Here is the sale history of this house approximately: 1988 sold $72,000; 1991 sold $82,000; 1995 sold $89,000; 1998 sold $99,500; 2001 sold $72,000. The woman I was appraising it for was the purchaser at $72,000. I know this area and I know what happened. This is what eventually happens when appraisers play the make the number game. Prices ratchet up, market drops, bottom falls out. Naturally this idiot woman reminded me that the house sold for $99,500 three years ago. I then reminded her that it had been on the market for six months and she was the high bidder at $72,000. During the property inspection her husband, who is a property inspector, happened to mention that if his kids left their bicycle on the porch over night that there was a 100% probability it would not be there in the morning. That explained the prior sale history. Principle of change at work.