I, for one, seriously consider the sheath when buying a knife, as a belt knife is almost useless without one. It is an integral part of the investment, and a cheap sheath makes a nice knife look cheap too. It is important enough to me that I might buy a similar model knife in a different brand to get a decent sheath.
I know that some want Kydex, some want leather, some want water resistance, etc. I wish makers would sell all of their belt knives and big folders with a cheap temporary sheath at a reduced cost, and make several different sheaths immediately available online or by mail for each model at a reasonable cost with a coupon. Everybody saves money and everybody is happy.