For what it's worth - not being negative(honest) but being realistic. No one is going to buy a franchise for the site(at the moment).
You need to concentrate on your own site to get it established. I'm not sure who your web designer is - but the site doesnt rank in google at all, it doesnt come up in any of the listings for "supra for sale" in google. It should have something there by now as it's been live for months.
Your site is a fairly simple one and I could either just write myself or get a developer in india to do it for a few hundred quid to make a similar site, that would then be mine and I could have a generated income from it.
Work on your brand, get the site established, get yourself 100k+ pageviews a day and then you may be in with a chance.
If you need a good SEO company, I know a very good one indeed. I know how to get a site ranked but I'm not an expert.