Almost two years late, but...
Sampras skipped the 1996 Olympic and focus [sic] on playing small events in his country.
...isn't true on both counts; he consented to selection for Atlanta when he could have declined like Courier and Chang,
{Buffalo News] and as he himself did in 2000.
{BBC] He then withdrew the week before with an Achilles tendon injury.
[LA Times, NY Times] Also, after Wimbledon finished in the first week of July, Pete didn't play again until Cincinnati in early August, the week after the Olympics had finished. Gold medallist Agassi was also in Cincinnati, demonstrating that there was no scheduling conflict.
Having said that, there's little doubt Sampras didn't miss being there;
"[He] has never been more than lukewarm about the Olympics, frankly admitting that he was mostly looking forward to watching the basketball competition." (lifted from the
above LA Times article) And six of his fellow top tenners, including all the reigning slam champs (Becker at AO, Kafelnikov at FO, Krajicek at W) were disinterested absentees, demonstrating that it had little significance for players in the 1990s.
Since 2008 it seems to have become a much bigger deal emotionally, probably because some of the Big 4 started to add it to their resumés and their internet fanbases got overexcited. Its rarity value adds to it too; Andy Murray was the only holder of an OGM in men's singles for a nine-year span, during which time nineteen different players won 74 Masters events. And I'm pretty sure the Scot wouldn't swap either of his golds for another common-as-muck M1000 title.
So if we look at things from a totally objective and neutral perspective, the only thing we can conclude is that all the Olympics have been rubbish non-events with the exception of 2012 and 2016 when they were more important than a CYGS.