My minimum requirements for a jersey is that they are full zip (with a quality zipper), long enough, and provide a natural fit that moves with your body rather than the garment moving/walking. Ask any tailor, it takes skill and attention to detail to make garments that don't have puckering or mismatched fabric grains, and even more skill to do so with form fitting garments made out of elastic fabrics that must fit well when moving and when static. It also takes better equipment, more material, and more expensive material to make them.

In order to obtain that sort of quality, you often have to pay for it. But paying more alone, doesn't always get you that quality either, so watch out.