Sure, but some people are happy to pay extra, maybe it's the brand, or the style, or that one unique feature not available from another less expensive brand.

If you're on the move a lot then you and your luggage become engaged in a deeply personal relationship :)

I have a Delsey suitcase (with Samsonite they’re in similar price range). I was never too careful about handling it, rolled far on various uneven surfaces outdoors, and usually filled it up in excess of 30 kg with books and equipment—it was quite reliable, I’m sure it would’ve served me for years to come.

One time at baggage claim it came out without a wheel. I suppose it doesn’t matter how tough your piece of luggage is if your baggage handler happens to be having a bad day.

To replace the wheel a Delsey store asked me to give it up for three weeks in Hong Kong, which I couldn’t do. Some pricier brands’s policies promise 1–3 day turnarounds, which makes a difference if you’re moving around frequently.