Increasing premium costs should come as no surprise to anybody who can add 2+2 and come up with 4. Under Obamacare the insurance companies are being forced to provide coverage to potenitally millions of people for things they wouldn't have previously covered (pre-existing conditions). This will undoubtedley cause the insurance companies to have to pay out substantially more in claims than the premiums generate. When that happens the only recourse is to raise premium rates.
Econ 101: When costs go up, prices must increase as well, in order to maintain profit margins.
Since Obamacare failed to address the rising cost of providing the care to the patient, the insurance companies will find themselves between a rock and a hard place. Personally, I believe this to be on purpose and by design. When the kool-aid drinkers start bitching because, despite Obamacare, their health care costs are still increasing, it will be blamed on the EVIL insurance companies, and will be used as an excuse by the looney left to close down the insurance companies and move to a single-payer system
Just my opinion, your mileage may vary.