Collectors love opening nostalgic packs, and sealed product often appreciates faster than singles
Modern Japanese sets (Sword & Shield, Scarlet & Violet, Mega era) use letter codes SR, SAR, AR, UR while older cards used star symbols
And with a pull rate for Tekno cards of just 1 in 15 packs, these are by far the rarest versions of the cards
Others buy cards to sell them more expensively right away, taking advantage of the demand for certain cards one factor that sometimes comes into play is whether or not the cards are playable for the meta
That's great value, allowing you to reuse powerful enter-the-battlefield effects for free, while ramping at the same time