When you buy something, I bet you want it to work. Heck, even if you use something for free — maybe borrowed from a friend — I bet you want it to work. No one prefers hiking boots that are too tight (or too loose), a car that shimmies when you drive faster than 40 miles an hour, or a kitchen knife that can’t cut a tomato. And Web designers don’t prefer fonts that don’t fit a project, fall apart in different browsers or can’t be used in a mock-up.
We also don’t like wading through all of the fonts that won’t work for us in order to find the ones that will. It takes precious time away from other tasks and responsibilities.