I just won this lot:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2754292770&category=43371&rd=1

I have just started collecting tennis cards which is a small and new market. Can someone explain to me how a card can be 10 Mint or better. Are Beckett BGS and BCCG equivalent and what is the difference. Someone told me BCCG is for wholesale lots (bulk) cards. It seems like BCCG 10 is not that hard to get (I just won 10 of these). How much for grading each card? Thanks for your help. I'm really confused about this. I guess for 50 cents a piece, I can't go wrong.