A $10,000 reward for a potential vandal accused of millions in damages. An intense battle between year-round locals and ultra-rich seasonal residents. This is more than the makings of a compelling beach read — it's actually happening in the island community of Nantucket, as the Wall Street Journal has reported. The story centers on Sconset Bluff, an oceanfront area of Massachusetts known for its beautiful homes and breathtaking views. But erosio…