You could just as easily be in an active clan that donates well. So its not a major benefit. The ability to attack with new strategies and not worry about cups on your main, it probably the biggest benefit you get from multiple accounts.
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This is the biggest benefit especially if you have accounts with similar troops and levels. I play on 4 accounts (loser status) my top 3 are pretty even with each other. if i need a golem or a hound or pekka I just make it in one of my accounts and donate to myself.. plus all 3 of my accounts are top dogs in my clan so it's nice being able to donate to yourself equal level troops.. another thing is when I'm raiding late nights when nobody is on I can go into my alt and just donate to myself. Best thing you can do as a noob is start a 2nd account..