Some people lost a lot of money on prosper.com, and at least in some cases, it was known that it was money they couldn't really afford to lose. See e.g. this (and be sure to read the last comment): http://www.bloggingawaydebt.com/2007/01/would-you-lend-75000...
I've tried to find more up to date information on him since that post is over 7 years old now and can't. Do you have anything more current or more details on the user pensioner?
ericscc.com appears to be gone as well as any of the other prosper forums I've found links to. Not really familiar with the site so is it basically dead or moved out of p2p or something?
The one forum site that still seems to be active is prospers.org, where pensioner was active as late as 2014. Not much conversation about prosper anymore, though (The old timers still there have thoroughly soured on p2p lending).
prosper.com itself is still in business. AFAIK they have pivoted to a much more conservative lending model. People who invested before 2010 or so generally lost money, some of them a lot of it, but the current model may be sustainable.
ericscc.com appears to be gone as well as any of the other prosper forums I've found links to. Not really familiar with the site so is it basically dead or moved out of p2p or something?