I don't. To people who are looking to receive a loan, this is an easy way for them to get rid of their account if they're looking to sell it. For example somebody could buy a senior member account, then ask for a loan which is higher than the amount they bought it for. They then would be able to receive the loan as the account going as collateral. They can easily default and walk away with a "profit". This collateral opens up to scammers so easily. As for the account on hand, it might receive negative trust and it may take a lengthy period of time for it to sell.
Maybe trading accounts can have issues but the scenario you mention is not one of them. The bold part is the problem here, not the fact an account is used as collateral. For a loan to be secure the collateral must be worth more than the loaned amount plus interests, normally at least 110%. If in doubt how much the collateral is worth then the lowest price should be considered. Also the collateral must be very easy to sell. When an account is used it should be taken for a low price so it's very easy to sell at that price. Measures must be taken against hacked accounts, such as demanding a signed message, and loans must be public so one can know an account used as collateral doesn't have other pending obligations.
The scenario you describe can happen and be a problem with any collateral at all if it's worth less than the loaned amount: "Just buy some DOGE, ask for a loan worth more than what you paid for the DOGE and walk away".