As I know to send token you must pay commision, and for the most tokens from airdrop, you will pay more than they cost;) Or sending tokens on this address is free?
Yes, you must pay a small about of gas (ETH) to send tokens on the Ethereum platform.
Can someone tell me what the benefit of this is?
You answered your own question:
having them out of your wallet
yes, you must pay gas, but this if for those that don't mind paying a small gas fee to keep their primary wallets organized.