Look at the search engines like google and ask.com they are all free and make millions of dollars profit
because they get so many hits they charge a bomb to place adds on there site to keep it free to the general public
planet sand should do the same
if the sponcers on the site like builders cant afford it who cares
lager corporations like castrol ,shell ,yamaha , suzuki,honda ,dg performance,pro circuit ect ect ect they would pay.....as long as there are plenty of members.