That would not be what invites are worth, that would be what membership is worth.
I think the current system is ideal for what it is rating. Invites are worth more because of rarity and difficulty to obtain. This makes sense when addressing the question "what are invites worth?" But you are trying to address an entirely different question, "What is a tracker worth?". For trade value appraisal, the current system is great! If you think that the content is bad, then don't pursue an invitation to that site (ie. UK-T).
In short, I think if you want to make a new thread with more comprehensive ratings of sites' quality, then go for it! Just don't make it about trading value.
Bookmarks