Currently BTCJam's repayments rate are 86% in overall and increasing, mostly due to the constant improvements of the credit score system. For A class, for instance, the default rate is ~2%, far below the majority of credit geo-markets repayments rate - in my country, the national default rate is almost 17%, which makes it more safe to invest money in BTCJam that selling goods in a supermarket.
In case of defaults, BTCJam has an agreement that allows it to disclosures all information provided by the borrower and share with the investors, so they can decide how to follow up and proceed with the collections.
Each day, with the Bitcoin reaching the 1000USD mark, the small loans defaulted in the past are becoming more and more valuable to collectors - many users already realized that and are using the arbitrated award certificates and buying the notes to start their own collections processes or taking legal actions; there's for instance, a one year-old debt worthing 150 BTCs that even defaulted, the notes sold below the rate had profited more than 2 times the original payoff.
So no, BTCJam is not a SCAM, it's a serious business that is consolidating trust and reputation as a future commodity, using the asymmetries of the current financial system and sharing revenue among peers worldwide. The ones who didn't realize that are mistaken the business with a really small part of its users, and certainly are already missing several opportunities to make great investments.
You are talking out of your ass.
I am yet to see proof of that, I only see lots of defaulted loans, people trying to collect, you not doing your job (some defaulters want to pay partial loans, that can be done with some tech fix, but instead those people are instructed to buy notes, this is fairly shitty, since some people get money before others AND it is cumbersome to deal with), and some on purpose defaulters (like Conny) not getting their information released at all.
Of course your "A" class has default rate of 2%, when people default you degrade their score... It is easy to say that people are defaulting only 2% if you remove from the counting any defaulters.
And you are also a scam because beside you that recently came here on the forums, BTC Jam crew ignore everyone, I am sending e-mails for almost a year already, with no reply, and other lenders that are in contact with me say the same.