IF ALL ASPHALT/FIBERGLASS SHINGLES NOW HAVE A LIFETIME WARRANTY, WHY SHOULD I UPGRADE FROM THE ENTRY-LEVEL GRADE SHINGLE TO A HIGHER-PRICED UPPER LEVEL GRADE SHINGLE?

That’s a good question. The biggest difference in the grades of shingles are thickness (weight), and appearance. The lowest level shingle is designed to be functional, and have a low price point. As you move up in grade of shingles, they are thicker (weigh more) and have a more aesthetic look. Besides looking better, the higher grade will last longer. Shingle warranties are prorated, so read the fine print. Generally speaking, warranty claims are minimal, so one should be realistic about what a lifetime warranty is worth.