Something for you to consider - your membership prices are not based on reality, therefore I will not even consider them for a millisecond - for example:
I have several Porsche's and have been a paying member at Rennlist for 20+ years, and it costs I think $17 per year. It has a VAST, VAST wealth of information for all my cars, arguably the best on the Internet.
stingerforum.org
But here, you are charging $60 to $100+ per year for a site that whose content is not even remotely as rich as Rennlist. The Stinger has been out only 6/7 years at this point, and it appears people don't hang onto them based upon their post count.
As a guitar player, another site I've been paying for 15+ years is TheGearPage - the content is absolutely incredible with amongst other things, professional musicians post their hard-earned experiences with amps, cabs, guitars, tubes, speakers, playing technique, amp repair, etc. and it costs $15 per year, but I opt for the 'gold' package at $25 per year because I get SO MUCH value out of it.
To sum up, I would gladly pay $20 per year for this site despite it not being not-even-remotely as rich as the two mentioned above - the content just isn't there. Therefore, getting $20 per year is better than getting $0, and I would gladly pay it out of principle even though I'll hit the site every now and then. Likewise, out of principle, I will not pay $60 to $100 for an 'inferior' product.
Just something to consider.
I am for you, not against you, and why I responded as I did.