how the bike looks is far more important then "service records". If the bike looks like its been trashed and not taken care of, I don't care what service records you have!

Some people like to get an owners manual when they buy something, so you may want to get that on e-bay or something.

Besides that, its a bunch of paperwork.

Unless its been something like an engine rebuild, or something done internal (not seen by eye), you can usaully tell how something was looked after.