Why don't you want to use Oxygen therapy? Was a cannula, or mask suggested? Did your Doctor order C-PAP for a good night's sleep? If your had diabetes would you take insulin if needed?
The reason you were prescribed oxygen is that with COPD your airways are obstructed and can't supply enough oxygen to your heart and body. Oxygen is the main nutrient for all cells in the body including the muscles, lungs, heart and brain and it is crucial for your body to have an adequate supply of oxygen for proper function. Having a good supply of oxygen may help alleviate sleep apnea and snoring.
Snoring asides from the fact that it is creates noise pollution, it is the result of air laboring through one's lung all the way to the throat and that labored breathing places a burden on the heart. Moreover, not supplying your body and specifically your heart with the oxygen needed to compensate for the loss oxygen supply caused by COPD, places an additional labor and burden on your heart. Over time this burden to your heart causes it to overwork and enlarge and your heart walls to thicken making your heart less effective in performing it's main function to supply your entire body with the much needed fresh blood and nutrients.
This condition of the heart is called congestive heart failure and it could be a direct result of not using your prescribed oxygen the way it's prescribed. Plus not using oxygen as prescribed limit your mobility because you may not be able to maintain a physically active lifestyle which may bring one weight gain and make you a magnet to a whole host of chronic diseases such as Type 2 diabetes, high blood pressure and heart disease. I suggest you follow your doctor's orders and use the oxygen as prescribed.