Yeah until it comes back and bites you in the a$$. Even toy projects take longer than supposed because we devs think it's a one time thing only. My experience is most of the time software lasts much longer than expected.

Not for customers. What we developers call quality is usually readability and maintainability. But that doesn't affect customers one bit if the software solves the problem it is supposed to.

Of course it affects price and development speed which may in the long run sink the company in the marketplace, like what happend to e.g. QuarkXPress.

Whatever happened to QuarkXPress? I remember seeing it all over the place and it was the de facto standard in desktop publishing for quite awhile in the 90s, but then it just sorta... disappeared. Do you know of anywhere I could find a good technically-aimed history or breakdown of what went wrong?

Not sure - rumor is they outsourced all development to India to save money. But the program became very crash-pone, and they became extremely slow to add new features. And then InDesign came on the market, iterated quickly, and ate Quarks lunch.