Why would ECW being dead make Vince more money? They weren't a competitor, and they weren't taking an audience away from WWE. Ever. ECW fans watched everything, despite the myth that they were only into ECW. ECW being around meant WWE always had access for new talent that were already semi-known on the national scene and wouldn't have to build them from the ground up.
Despite what people think, Vince was never trying to seriously put any group out of business except WCW. Even during the expansion era, he wasn't just taking top stars to be spiteful. When you go back and look, he was taking guys who had already done everything they could do and were even past their primes. He was almost never taking the top stars of various territories at the peak of their stardom there, and if he did, he compensated (most seen with Stampede).
Throughout the 90s, Vince always supported every minor company that wasn't WCW. He sent talent to USWA, SMW, and ECW regularly. In the late 90s/early 2000s, he sent talent to UPW before they were even developmental, and allowed talent to go to ROH multiple times. And today, Triple H was recently promoting EVOLVE dates on twitter.