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I kinda agree with Quickseller. When someone desperately needs money to resolve something - everything else is secondary then.
It is not necessarily a function of being desperate, it is a function of market economics. People in happy marriages pawn off their wedding rings all the time to meet current financial needs, and pawn shops lend out amounts in line with what they can sell them for at a profit if/when the loan goes into default (although someone pawing off their wedding ring is probably in a desperate situation, so maybe this is a bad example). Other examples of people taking out loans similar to "account loans" would include people taking title loans against their car, and home equity loan against their homes. They also pawn valuable property that is not as sacred as a wedding ring.
I'm not too sure how frowned upon it is to sell accounts that you've received through lending as collateral. I've seen quite a few high-trusted members in the past that sold accounts that they received through lending w/out any repercussions.
Yeah, a few years ago it was kind of accepted. At least it wasn't enforced like it was today. However, these days I think users have become aware of the problems with selling these accounts, and are now actively fighting against it via the trust system. A few high ranked members have been tagged recently even when selling accounts received through collateral.
This shows the importance of not accepting collateral at a value the lender is not confident he can sell quickly for the amount lent, plus interest, plus the value of his time selling the collateral. A smart lender will be familiar enough of the market of whatever he is accepting as collateral to know how much he can sell whatever he is accepting as collateral, and lending out sufficiently less than a quick liquidation value so the borrower has sufficient incentives to repay his loan. In other words, the lender should only lend out so much based on the collateral he is receiving so he will profit if the borrower defaults on the loan.