Time and money, as they stated when they started development on their MOCVD lasers, they need a secure source of cashflow so that they can develop their RPCVD technology to a commercial level. From the under preforming CR's in recent years you can see that investors don't want to be supporting the company for years to come through constant dilution of shares so they needed a product line to secure them as a profitable business
Fortunately for them they've quickly developed MOCVD products that are out performing existing counterparts so once they've secured some long term customers it's only a matter of time till you start seeing some truly revolutionary stuff coming out of BLG when they no longer need to worry about securing funding just to keep the lights on
