If the person leaves the room, you can't pick up your seat and follow them
Like most One Piece TCG cards, the value of Soul Pocus depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Starter Deck 7: Big Mom Pirates)
Though they contain fewer art treatments than a Collector booster, you can still get almost everything
You should always do your own due diligence and research when investing in sealed MTG booster boxes to assess their pros and cons, and if investing long-term, be prepared to hold them for a minimum of 5-10 years before selling
Mastery Pass If you buy the Mastery Pass for a particular set, you can get one regular and one exquisite card sleeve (assuming you hit the associated Mastery levels)