I've found that being tied to a single insurance company isn't necessarily the best deal for me. Insurance companies manage their risk and portfolios just like any other cautious investor - when they are overweight in an area or thinking the overall risk of that part of their portfolio is increasing they raise rates.
At the same time, another company may be trying to diversify by building your type of insurance into their portfolio.
So I agree with bgum, Progressive is saying that they don't want your business - but I bet there is somebody out there who does. Good luck!