Where do these investment grade notes come from? Again, institutional investors are not selling their notes on Folio.
I don't think a snapshot at origination of only the stated income, city/state, credit data, and employer is going to enable institutional investors to snatch up 100% of the "good" loans. You just don't know how they're going to play out. All they can do is grab some that
look good based on very limited information.
But once on Folio and there's several months of payment history behind them, you've just eliminated all of the 1-and-out scammers, you know who lied about the loan purpose, maybe even get a feel for who started rack up debt again, and in general you have a much better feeling for who's going to pay. Even if you don't believe a word of this paragraph, there are tens of thousands of really good notes on Folio that look good now
and looked good at origination, and yes many are overpriced (many are not), but they got there somehow. If your theory was true they shouldn't be there at all. Institutions aren't getting 100% of the good stuff. Not yet.
If you'd like, why not run a simple test? Whip up your super-duper filters that are going to pick you out the best loans. See how many brand new notes you get after a week from new originations. Then run those
same filters on Folio (no cheating) and see if you don't still find tons of them.