Time to sound the Tocsin?? revisited

See the post for 9/9/08, time to sound the tocsin. I have been pondering that quote for a week now and I realize that Director Lockhart may have meant that investors are only buying higher quality mortgage backed security portfolios, especially those with low or no exposure to sub-prime mortgages. Of course the higher quality MBS command a higher price than those with riskier mortgages in them. If you have an opinion on this please express it in the comments section.