federer was 2 points from the title..being that close to winning wimbledon and losing would hurt (even if he did win 5 times already)..if he didnt care he wouldnt be the champion he is..
also we know always has one eye on tennis history, so being 2 points away from a record breaking 6 in a row at wimbledon would also gnaw away at him. (*renshaw won 6 in a row in 1880s when the title holder only had to play in the final the next year so it dosnt really count but we have to mention it

)