"GOF has seen a pretty steady increase in both pps (from 4.43/share to $21.84)"
Where did you get $4.43 from? The 2009 low was about $7.50, down from the 2007 IPO at $20. Again GOF is mostly a bond fund. You should wonder why it dropped so much, and whether it will collapse again in event of a bear market.
If you like leveraged investments, you could have done vastly better buying a simple S&P 500 index fund (like SPY) on margin in 2007 or better yet, in 2009.