Nowhere does it say why you think that buying Block Erupters will be a good idea.

The facts are very simple. If you have 1 BTC and you spend it on BEs, you will receive less than 1 BTC of mining income. Sure you can use what income you get to invest and try to profit from investments. But if you just kept your 1 BTC and invested it immediately you'd have more BTC.

Your offer of 5% of the loan as collateral in the form of BTC is pointless. The whole purpose of collateral is something for the loan-giver to keep / sell when the loan isn't paid back. Consequently, the value of the collateral needs to be at least as much as the amount loaned for it to be useful.