[NikolaNovak]

Glossy screens generally have more vibrant colours; matte is inherently somewhat muted; and in some scenarios have better contrast and brightness.

(Also: PRETTY! and APPLE! are important psychological factors as well :P. Joking aside, many people will look at vibrant screen and how pretty it looks and make their decision without considering the specs, details and use cases )

For myself, in most situations glossy screens mostly mean I can see everybody behind me better than I can see my work; but they do have their place, especially for professional design/video/photo work IN (and this cannot be overstated) well controlled environment (basically, make everything BUT the screen non-reflective / control the light:).