[JustAnAmerican]

Short of outright greed, is there a reason borrowers interest rates are going up while the base rate stays the same?

[Starwind]

is there a reason borrowers interest rates are going up while the base rate stays the same?

Mortgage rates and lender profitability are driven more by rates on Mortgage Backed Securities (MBAs) which trade at a percentage spread above treasuries.

Several factors contribute to a rise in MBA and underlying Treasury rates, primarily increased risk and lower demand.

See the discussion posts in Mortgage Meltdown?, and alos follow the links to other threads/articles posted therein for added background.