Theres no reason for grinders and players to buy cards from each other at full retail when other grinders and players would be more than happy to undercut SCG/Channelfireball and secure the sale, so TCG low is a more commonly used number to start from when conducting sales between two non-store parties
Usually by the time I get the deck I want together the format has evolved, either because of a new set or simple because players have adapted to strategies and now my deck is obsolete
But remember, an expensive Energy card today can drop in value as the market fluctuates according to buyer demand, seller supply, and trending chase cards
best of all, that story isn't in any way a prerequisite to appreciating the card
On top of all that, Buster Sword is colorless, and equipment is a supported theme in the set
These cards often have special storage requirements that differ from your bulk collection