Posted By:
Robvintagecardprices.com may succeed, but it won't be from people & their mindset on this thread as:
1, People want something free, but won't subscribe at $10 month.
2. Ebay past history sales and smartcollector.com appar too provide much the same information. Also, the auction houses often have past results and further information can be gleaned from Search engines.
3. The hobbyist looks at past history not as work, but as entertainment.
A PSA 6 vintage card can easily be undergraded or possibly undergraded, accounting a large variability on prices. A rare PSA 2 can look cool, or crappy, accounting for even larger price variation. 2 "Gotta have bidders could be going after the same card in 1 auction, but not other times. Well disguised shilling can skew numbers. These are only a few things off the top of my head that shows pricing vintage cards is an art, not something lends itself to a computer data collection or creating a "stock" portfolio.
This website MAY be of value to the ebayer who finds a low priced vintage card(s) not properly described in the title, in the wrong category ect. That's a rather tall order with vintage cards. It may serve the dealer of cards produced post WWII.
BTW, I may sign up for a week trial, hey, I like something free too.