I really think it hurts the entire series overall, since the amount of different decks in the series essentially doubled overnight, and there are 60000 extra decks in the series that used to be quite limited. I don't think I would mind as much if they only released a reprint of only the v6s or even the v5s, but to go all the way back to v3s is really just diluting the value of owning any individual deck in the series, resale or not (again, v1 and v2 aren't really affected by this and I think their value won't drop).
so yes, it hurts resellers, although I and pretty much everyone here don't care about them. It hurts people who only wanted v7s, but it also hurts people who already own the originals, imo. I don't actually have any Smoke and Mirrors besides v6 so don't take this like I'm complaining about my own decks, but this is just in my opinion somewhat of a downfall of a once prestigious series of playing cards.