Every account gets real, validated snipes — not a demo, not fake data. Subscribing removes the limits that keep the free tier's server load small.
Every query re-runs a real analysis against Blizzard's own auction data — it isn't free for us to compute. Capping free accounts to one realm keeps that cost bounded without capping the accuracy of what you see; a subscription removes the realm limit instead of the accuracy.
No. Every tier reads the exact same validated, inferred-sold-price data, refreshed on the same schedule. The only differences are how many results come back per query and how many sell realms you can pick from.
Not on the free tier — the lock is set the first time you query a realm and stays fixed. Subscribing removes the lock immediately, letting you query and switch between any collected realm.