I doubt it or it would have happened before now.
Hell, they just made over $20 million on the movie and I think the 3 surviving members like the cash in their pocket more than spending it on a top domain.
Rick's whole motif has always been asking more than the buyer can pay, and then laughing about it online. He's got more money than he can spend in a lifetime and I think he absolutely loves playing the old guy yelling at the kids to get off his lawn.