Why do you use multiple wallet, did you cheat at bounty or airdrop project, you can use your one wallet for transferring your bitcoin to other exchange account with less fee, never use multi account for joining at bounty or airdrop project because is not good ideas.
No, I'm not cheating. I've used diff wallets like electrum, Bitcoin-wallet..etc and am planning to "move" them all to a brand-new hardware wallet.