there's nothing wrong with your return perse, it's the lack of other sources of income that i find kind of unusual, considering your level of work-related income...but, it sounds like you have that covered too so, good for you! i'd be interested in where you are squirreling money away (other than retirement assets) where it's growing in value, yet not generating any taxable income? i mean, even if it's tax-free muni's it would still be generating tax-free income that should be reported on Form 1040, line 8b.
and, your tax returns IS simple and there's no reason in the world why you shouldn't do it yourself, if you are so inclined.
by the way, i'm a certified public accountant, i have a masters degree in taxation and i'm also certified in business valuation, forensic accounting and litigation support (if you ever have any questions)...oh and, i have a number of california clients, so i'm familiar with cali tax statutes