If you open up the case on a Fluke and compare it with a cheaper one, you'll see there's significant differences in construction and design. This isn't because Fluke did it just to justify their higher cost - it's different because it needs to be, to give you safe operation, accurate results, and long life.

I've been through any number of cheap multimeters over the years and finally broke down and bought a Fluke. It's been absolutely solid. Worth it.