It's a drop in the bucket as far as big money goes.
lets say Stern does $100 million in sales. Harley Davidson sells $5B a year in motorcycles that's 50x as much as Stern.
I say Motorcycles because most who own a MC also one a car, so the MC is a luxury item or a toy.
Same with boats or small watercraft. Boating market is something like $37 Billion. Something like 40-60K small watercraft in the US each year.
this report says 250K new recreational boats were sold last year in the US are you kidding me?
https://www.tradeonlytoday.com/by-the-numbers/boat-sales-topped-250000-in-2016
Annual U.S. retail sales of NEW boats, marine engines and marine accessories totaled $17.4 billion in 2015 and are expected to grow to $19.1 billion as numbers are finalized for 2016. There were approximately 238,000 NEW power boats sold in 2015. The NMMA expects this number to grow to more than 250,000 for 2016.