To clarify, I am not prescribing anything or telling anyone what to do. If you are lending money as a business, you probably need to cover your costs somehow (that money has to come from somewhere), whether by charging interest or via some alternative arrangement such as profit-sharing. If you are offering loans at 20000% interest and someone accepts, then they brought that upon themselves (or more likely are trying to scam you), but that's just crazy and I have no qualms about calling you a thief. However is 300% acceptable? How about 30%? 3%? I would rather not try to seriously argue this here, or be glib. Perhaps there is no "Bitcoin philosophy", it is just a tool and certainly does not tell you how to set interest rates, but I was suggesting that reducing the cost of transactions should be on people's minds, and there is no reason why things should evolve in the direction of insane loans.
Yes, as explained interest is high but for short term loans. As demonstrated, the interest rate is based on many factors including Trust. I rarely lend on the forums. But when I have done so, I feel I have offered really reasonable rates.
Please remember, a 10 BTC loan at 15% or 30% MPR is reasonable considering the time required to service such a short loan.
Again, if you have Trust from the lenders, the interest demanded can be a lot lower. The important thing is to start acquiring trust so that you may lower interest that you have to pay.
If you are just asking for a 'friendship' loan that is another matter and is often done for 0% or cost adjusted rates. But you can't imply that 'letters' in a nick on an internet forum about the bitcoin community raises the standard of association to a 'friendship' status.
While I don't necessarily agree with IBB as a business model, I do agree with their intent. The interchangeable words of 'gratuity' and 'interest' doesn't bother me. I bet they at least keep track of the amount of 'gratuity' that was given for each loan size and from whom.
But their intent is still an important part of the community, as is the more traditional business models.
btw: I think the last loan I gave on the forums was for 3% MPR. Can't remember might have been 1%.
If one wanted to and was willing to take the risks involved, you could displace all other lenders. Or at least, get them to pay you to not issue loans.