I run a 25/75 mix of premium (corn) fuel and VP-C12.The only reason I mix it,is because here in New England,all fuel is mixed with Ethanol(corn).Not only does it make engines run extremely poor,it also tears up carbs/fuel systems....if you let anything sit for long periods of time,4 months or more,it gums/clogs jets and floats.There's ALOT of engine failures because of it....it's one of the worst creations man has ever developed!!!
I don't think South Cali is using Ethanol yet
...so I'm willing to bet your premium pump is 50 times better than here.
As for your question..."is it worth it?".Is your bike pinging/detonating?...if it's not,you're fine with pump.If you're running wide open alot,I would suggest a mild mix of pump and race fuel.
Pump gas,at least New England pump gas,I try to use within 3 weeks of purchase(even with Ethanol treatment)....and I know guys that have stored VP and Sunocco Cam2 for a year in metal drums with no problems.