After owning a boat dealership for a long time (Mike would say too long).....one thing we have heard a lot....over and over in fact.....is that hours are all that matter when buying a used motor or boat.....
"anything over 1000hrs is worn out junk"
Well, we have always said that actual condition and maintenance history matter far more than the hours on the gauge. To prove this point, compare these Yamaha F150 efi 4 stroke outboards we have checked this week.....same generation power heads, but different cowlings....
Boat one - 2007 monohull
Motor 1:
2007 Yamaha F150 - starboard side
290hrs - excellent condition
Compression in psi, checked cold, throttle open: 185/183/180/186
Motor 2:
2007 Yamaha F150 - port side
293hrs - excellent condition
Compression in psi, checked cold, throttle open: 185/185/185/186
Boat two - 2011 multihull
Motor 1:
2015 Yamaha F150 - starboard
2466hrs - excellent condition
Compression in psi, checked cold, throttle open: 179/180/179/179
Motor 1:
2015 Yamaha F150 - port
2461hrs - excellent condition
Compression in psi, checked cold, throttle open: 176/172/175/172
Boat one is a well maintained pleasure boat. Boat two is a well maintained commercial boat.
Only 5% difference in compression, but 2200hrs more use on the commercial boat.
So, would we buy the commercial motors with nearly 2500hrs?.....absolutely!.....We would buy the 2007 models as well, they were very, very good too 
The moral of the story is, hours are irrelevant if the actual condition and level of maintenance is at a high level.....we would rather have superbly maintained motors with high hours, that neglected, untouched motors with low hours......