Do VCP and CardTarget show a better picture than POP reports?

[bn2cardz]

Recently there have been a couple threads where it has been mentioned that Population reports don't give a full picture of what is out there. I was curious if it was posted that there have only been so many reported having been sold by VCP and Cardtarget along with posting pop reports would this be a more acceptable way of displaying known market quantities?

I know there is still a hole because some cards may be sold in lots so neither past sales sites have the data for that. Also those past sale sites don't catch sales at shows and between two collectors outside an auction site. I would think it helps get a better picture.

For instance I have a t206 card with a tougher back (since I may be selling it soon I don't want to say which card so it doesn't look like I am advertising it here). This card is in a psa holder, but was graded before backs were looked at by psa so looking at the PSA pop report there are none graded. Looking at the SGC pop report there are two. VCP and Cardtarget do not show any past sales of any raw or graded. I have found pictures online of one of the SGC cards but it is the only picture I can find of one online, from what I can tell it is in a private collection of someone doing a back set.

So in this case if I just looked at pop reports it would show that there were only two graded. When in reality there are at least three including the one I am holding. Yet looking at VCP or Cardtarget you would say there are none known from past auctions. Which is also not true, because the one I own came in a lot of cards in an auction within the past year. So though it isn't fail proof would it be safe to say that combining the pop reports with past known sales sites could give a fuller picture and thus would be a better way of advertising the card instead of only counting on POP reports?