I also invest in a site called funding circle which, when someone defaults, has a part of their organisation which chases debt on the lenders behalf. I have never had a problem with the latter.
I would love to invest in people via BTCJAM again, but as there is no comeback on people who do not pay....I can`t see its recommended.
I think this is mandatory! You mean that btcjam does not chase the defaulter in any way? It passes it along to investors?