I do not think 101 is enough to diversify and even maybe 200. Sure defaults are up, (had a perfectly good FOLIO with 13 payments left just go BK yesterday with a 720 unchanged FICO) but should not be up that much that people can actually get negative returns. I would be curious to see if the number of investors who are below 0 sold out after LP day on FOLIO and took massive losses.
Now you are implying that we should all buy 5 million dollar worth of notes just to make the LC's statistical assumption work?? :-) 200 notes is pretty reasonable, wouldn't you think?
About using FolioN/secondary market, you know what? A paradox: I was getting better returns when giving course to my gut feeling of bad payers (in grace status etc) and liquidating them fast and even at a loss. Now lately, I decided that it was too much work to track them all and be ultra-passive and do nothing instead. And guess what - defaults started to pile up and overall return rate massively decreasing!
I was making this rule myself: didn't matter to me that a certain note/borrower was in a grace period only for a short period and then s/he got back with all the payments. On contrary, I was keeping track of those specifically, and made it a rule to sell them ASAP as soon as they recovered from "in grace" or "late 30 days" status. And that strategy never failed me - someone who is lazy or ignorant ONCE, will be again soon...
But now I've got sick of these games and time needed to be spent for this. Waiting for my existing notes to mature and ... Au revoir LC!