I batch as per conditions, there shouldn't be too any big difference between 30 similar images shot under the same conditions - if there are your exposure technique needs work. The key to professional standard output is consistency.
OTOH 30 similar images with exposures all over the place won't easily batch process, that's when you find yourself spending 5 days processing a set of wedding images to make them look consistent. You've just ruled out the chance of any profit - unless you're charging the kind of money that's enough to run a studio (without the actual studio overheads).
I don't know what camera you shoot but some pro's will shoot a test sheet for CWB whenever the conditions change, some will set their wb to a known point (and reset in different conditions) which gives a head start on the processing. Some just use AWB and wing it.
There's no one good way to do it - but everyone would agree that consistent exposure is a cornerstone to an efficient post capture workflow.
I always save my RAW files out as full quality JPEGs, the only processing done after is a little cropping and cloning and B&W conversion. There's no significant loss in quality to occur once you've got your standard image as a high quality JPEG, my files are large enough to work on without the hassle of supersizing them for no significant gain.