The biggest danger is that the original owner can take the account back at any time. Even if you change the password and email, the seller can contact , provide the original account creation details (like a photo ID or the original secret question), and claim the account was "hacked." Blizzard will almost always return it to the original creator. 2. Violating Blizzard’s Terms of Service (ToS)
Buying or selling accounts is strictly against Blizzard’s rules.
If you want a competitive collection without spending thousands, try these "legit" methods:
These offer the best "gold-to-legendary" value in the game. Saving 2,000 gold for a Mini-Set is far more efficient than buying random packs.