Local shops often build strong reputations within collector communities
Compared to booster boxes, which just have Pokmon TCG packs, Elite Trainer boxes come stuffed with extras: energy cards, dice, coins, sleeves, and - in this case - a full art Pecharunt promo
1.1 What is the Trainer Challenge
see introduction quote above), in Amonkhet's storyline (where his assault on the gods is done through a blast of white light, and he uses the Second Sun to cultivate his worship as solar), in post-Ixalan stories (as he holds possession of the Immortal Sun) and in his backstory in Core Set 2019, where it is shown that Bolas modeled himself after the sun, ruled his first kingdom as the "Second Sun," and his planeswalking manifests as golden light
While this doesn't seem to be the case, as lead designer Mark Rosewater has already said he's experimented with getting rid of the Reserved List in the past, people see the Reserved List as an unnecessary restriction that only helps the already profiting players