Like most Pokmon cards, the value of Lugia VSTAR 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 (Silver Tempest)
For those of you who ever wondered if blue mana could stop a handgun, now you know
Generating a monk who makes green mana, then giving two creatures +1/+1 counters, and finishing off by turning into Remnant of the Rising Star, which allows you to pay X to give a creature entering the battlefield on your side X +1/+1 counters is insane
In Pokmon cards, genres where popularity, scarcity, and condition differences are heavily reflected in the price have the best compatibility with PSA
The hand-refresher cards that they have available for use are good, making use of Professor Oaks New Theory and Copycat and they even emphasize the importance of energies by letting making you run Interviewers Questions
This early access and novelty can drive up short-term demand for Japanese cards