I have the same problem. Overnight 42 out of my 50 keywords all of a
sudden needed a minimum bid of $5.00. I have been paying like 0.25 for
over a month and have had GREAT response...some keywords are as high as
22%. Its ridiculous because my unique company name has even been asked
for a $5.00 minimum...this is not right. All of my keywords have high
click through rates, all are relevent, and for many there is not very
much competition. With 0.25 i was in about the 3-4 position for most
of my keywords. This is a Google issue costing me money.