Okay so there are 1850 members of the Thrust Innovations Buy/Sell/Trade group on FB.
There are 2215 members of the Super Jet, SXR & Stand-Up group on FB.
Instead of approaching this from a dollars spent guess, why not take a poll of how much each person spends in a year on average (new thread, or a FB poll) and then multiply that by.... 2000.... 2000 being less than actually exist, but you know that there are people who are owners who spend basically nothing because they don't ride or they don't mod their skis, or they're not on FB.
Just another way to skin the cat.