Dentures and implants are more about functioning teeth than "perfect" teeth. Poor folks can live with unsightly teeth but they can't subsist entirely on jello. Patients with unlimited dental budgets will be aggressively sold on root canals and veneers by every dentist they see. Most dentists don't want to make dentures or place implants, so they price themselves out of that market.

However, some dentists make inexpensive dentures, and poor patients will drive hundreds of miles to see those dentists. Because such dentists make 20x as many dentures as their higher-priced colleagues, they're much better at it. In this case price is negatively correlated with quality. The implant market isn't quite like that yet, but it's going in that direction.