Spin balancing works, we know it works, we know how it works, and it's not exactly difficult to get done when you get new tires.
I want proof - independently measured and verified proof - that beads work on a motorcycle, and on wheels known to be unbalanced without them. Until then, they're snake oil. "It works - we just can't prove it" isn't something I for one am willing to take on faith, in any circumstance, including this one.
Because one thing we do know about human psychology, and that is that everyone who believes they work, and really want to believe they work, will convince themselves they work. Even if the bike does the conga sideways down the road, people will sit there with a grin going "this is smooth as glass!"