If you're patient and strategic about which auctions you target, you can pick up cards below market value
If this card you control is destroyed by an opponent's card effect while it has material, and is sent to your GY: You can Special Summon 1 "Number iC1000: Numerounius Numerounia" from your Extra Deck, and if you do, attach this card to it as material.
This means Japanese collectors get new cards more frequently, while English collectors get bigger, more comprehensive sets less often
It's one of the most annoying decks in the game to beat
PTCG Live gives players quite a few semi-competitive decks to start off with, and those cards are also added to your collection for you to play around with
This includes any spells Edward plunders from the top of opposing libraries, and any booty captured by other pirates with similar effects (such as Beckett Brass)