Everyone has the tip to make a buck but this is a positive money maker. I have noticed that there are more and more boom cars on the road. I sincerely wonder how their ear drums stand it. In a few years the hearing aid companies will be doing a thriving business; I guarantee it. Invest now for much future gain.
Some are also saying that the low frequency vibrations will adversely affect the coccyx and cause depression at some point. I don’t know where you would invest to take advantage of this. Give it some thought.