That isn't the point. I understand trading and loans, I day traded options for years, although that was almost 10 years ago. Typically though you had to have $25k in an account before you could use a margin loan, but margin rates are great for short term loans. In the altcoin world the borrowing costs are just so high that the only one that will win in the end is the lender. I simply doesn't make sense. Besides if you are bullish and you the coin is locked up in an escrow it doesn't do any good as dumping is so common in the altcoin world.
The lender
has to win. His interests take precedence over the trader, as it is only natural. We are talking about loans not partnerships.
Any DECENT lender will let you withdraw some collateral if it exceeds the guaranteed margin otherwise you should choose another escrow/lender.
So if you get BTC giving, for example, 110% LTC and it skyrockets doubling its value any DECENT lender must release half of your collateral immediately.
Of course the opposite applies, if the coins devalue too much.... ouch.
This is what I offer to my customers:)