Well even tough they sound great , if I have them and I need coins quick , wouldn't I just turn them into Bitcoins?
No.
For example, 1 LTC right now is worth 0.02 BTC (Example)
You send it to a guy and he sends you the BTC back.
After a month, you repay the loan with 0.022 BTC.
He sends you the LTC back, which is now worth 0.05.
= Able to use the bitcoins for what you needed it for, and + 0.028 BTC.
True - and I must say there were cases where collateral after a month was worth less - like 50% less - then if someone will not repay his collateral might be not enough..
that's why good collateral is LTC. Price is quite stable.