Put it this way.
If you go full time you get to work under a full-fledged pro, assuming it's a reputable company that's been around for a few years. You can learn the ropes from him/her and get to meet bigger clients. You also get to handle more professional equipment and practices and work with other professionals in the field. This way you get to see what you can improve to be as good if not better than your peers. And assuming since it's highly likely you'll get more jobs with a full-time production house you'll improve quite quickly and be forced to learn things at a faster rate as the jobs require it.
Eventually you'll be a seasoned pro, can work on your own if you want cos you'll have an idea of what works. As you get better can demand more pay anyways.
just feel that you will need to educate the client
how much time and effort does it cost to shoot and edit .
To shoot a wedding -
Meet up - 1 evening
pre production - half a day , to plan and coordinate
book the date, camera check, itineray print out
production - One day
To edit a video -1week to 3 days - raw cut, edit cut , add in music, text and graphic
to encode the dvd , print the dvd label , check through dvd
Imagine the proper step to from a proper wedding video.
its more that ...have you add in your experience, your concept time.
Depreciation of your assets ...
I think you deserve more than what you ask for .