Here is my theory and it has something to do with institutional lenders.
Fact: Institutional Lenders snap up as many loan that match their criteria as possible
Result in: Number of loan available to purchase note decrease in LC (As of now, the total available loan in LC is 82)
If there is less loan to purchase, people is a bit hesitate to sell their notes
Fact: Institutional Lenders play by big money, big number so they will not set their default purchase note at $25
Result in: When they sell note in Folio after 3 or 4 months to get their fund and maximum interest, or when note go into default/grace period, most Folio users will not see these notes with their criteria (selling price is well above $25)