AOPA Vref.
Obviously others have consulted the same source. I'm a little confused since I'm getting a slightly different number now, but here's the numbers I'm getting:
Base price for the airplane - $19,900 - for that, you should have an engine at 900 hours and 6150 hours TT with average paint, interior and nothing outstanding on the panel.
High hours affect the price negatively at $0.43/hour - total effect -$2,523.90
Engine affects the price negatively at $11.00/hour - total effect - $9,900 (note, this is half the price of a new engine).
Bad interior affects the price negatively - total - $3000.
Net result is $4476 valuation. I'm not sure why I got $3500 before and $4500 now, but I'm sure there's some reason. The main point is, it isn't a $10,000 airplane.
And you didn't even have to wait long...
Don't confuse asking price with what you actually sell it for. The reality of this airplane is that it's going to need a new engine and significant interior work. If you do that, you'd have about a $30,000 airplane because you're putting about $25,000 of work into it.