The tires on your motorcycle are the most important safety device there is. Bald tires mean less grip in normal conditions, and substantially reduced grip with slight road debris or rainy conditions. Motorcycle tires don’t last as long as car tires, and sometimes, depending on you motorcycle and aggressiveness, you may even have to replace a rear tires after only 5000 miles, although such poor tire life is rare. I implore you to research the individual models of the tires you’re thinking of purchasing, as the performance of tires will greatly vary between individual models and tread patterns.
As a rule of thumb, I think of the following brands as high quality tires: Metzeler, Bridgestone, Michelin, Pirelli (low tread life), Dunlop, Avon.
The following brands are more of an economy tire, and my experience is that the quality and performance can vary a lot between individual tires of cheaper brands, most likely because their manufacturing process does not have high quality standards. Some of these brands are Kenda, Cheng Shin, and Heidenau.
DO NOT compromise your safety and ride on excessively worn tires