Umm... I'm going to have to ask the obviously stupid question. Why?
Answer is in why people use V6s, V8s, V10s or v12s in cars, a small 4 cylinder engine works just fine, gets good MPG and it gets you from point A to point B just fine, so why bother with bigger more powerful engines?
Answer is sometimes getting to point B is not the "point", lol, or the only point.
Sometimes it is about the journey as well not just the destination.
More power, may not be everyone's cup of tea, but some do like it and want it.
And some also like the "journey" of building something unique.
We could all drive white cars, or all red, or all grey, what's the point of having different colors?
Doesn't make car run better, no real benefit at all to having a different color cars, well maybe in the Walmart parking lot, lol.
Just a choice people want.