You were advertising your car.
It isn't, no.
Don't then.
I don't know about the specific hitcounts for Supras on Pistonheads or Autotrader. Or Ebay for that matter. I suspect it isn't as high as you think though compared to this site.
You knew before you posted, too. You even wrote it in your initial post. Can you understand why that's a bit cheeky? People pay £10 per year for this site because it pays for itself several times over in the first few months of using in 90% of situations. That includes helping people sell their car. The 'advice' you'll get on here regarding your question earlier would have been worth it alone if you think about it. Where else are you going to find honest, open-source pricing advice about Supras including every modification on your car? There isn't anywhere else you'll find it.