The YGO anime and video games were good, but no way as iconic as Pokemon & appealing mainly to male kids/teenagers, so it failed to scale
Rather than one 60 card deck, two 30 card half decks are contained in them
Getting a card appraised by the PSA helps establish its real value, so any serious card sale requires grading
Due to this and with only "Raye" as the only Main Deck monster thus far, "Sky Striker" Decks (namely pure-builds) need to run non-"Sky Striker" monsters to in-part have access to other Extra Deck opportunities (such as generic Rank 4 Xyz Monsters.) Further, "Sky Striker" monsters under a Spell famine are easily picked off via general card effect removal and can also be Tributed or used as Extra Deck material by your opponent
immediately after this effect resolves, Normal Summon 1 "Dark Tuner" monster
so here's all the information I found condensed into 1 easy-to-consume piece of content