I'm sure people who began playing RPG's with The Dark Eye in Germany, or Sword World in Japan do the same thing.
People like what they are familiar with. Which is usually the first RPG they play. And most people who got into RPG's are most familiar with D&D. Which defines for them what the RPG experience is.
There is nothing inherently special about D&D's system in any edition. In D&D's defense; in the few instances where other systems supplanted D&D in other countries: There is nothing special about those systems either.
It's all about First, Good Enough, and Servicing your customer base.