Cars no longer able to drive 100kmh

Recently I took a trip from Palmy to Wellington and I found the highways really interesting: not a single car that started out behind me stayed behind me. I was sticking to 100km/h the whole way - I'm not one of those idiots that drive at 80 without a care in the world - but every chance people got on a two-lane stretch they overtook me and disappeared into the distance lol.

To be clear, I’m not interested in the whole “I'm just a good driver so I won't crash” waffle. I’m genuinely trying to understand what’s the need to go over the limit. Is it more fun? You've got a nice car that you can't justify only going 100 in? Going 115+ instead of 100 might save you 5–10 minutes tops, but the risk of crashing or serious injury goes up so much... Not judging, just would really like to hear some reasons out of pure curiosity.

P.S. I stuck to the left lane, I'm not bothered by being overtaken at all.

Edit: Yes, I was going 110kph through the new expressway

Edit 2: Yes, I was going 110kph through the new expressway