Not cheap at all. It's actually inflated. The line should be Roger -150 at max. Murray is playing MUCH better.
This isn't Roger from 5 years ago or ever from last year so that means nothing to me. Watching the match against Novak he didn't look great even if he won. Roger also hadn't lost at Wimbledon for 5 years, and look how that turned out. Grass is his best surface too.