Time to use that useless Business Studies module: what's your unique selling point?
How long does it take you to edit, master and burn the DVDs and cover art? Additionally, how much do you earn for a typical day in your current job (not one I expect you to answer, just worth considering)?
You may find you're better off increasing your prices. I can't imagine it's a service that's price sensitive. Typically people will want "the best" rather than compare prices in one-day events. If you charge double for all your videos and get half the business... well, what would you prefer?
It would also be a whole lot easier to REDUCE prices than INCREASE them. Just a simple matter of stating 20% discount. This also gives a percieved bargain if I'm wrong and weddings are price sensitive.
Finally, think about the market you're pitching to. I know you said you want to attract people (and therefore build your business) by the pile em high and sell low attitude, but this may attract the bargain basement folks. I'm thinking here of payment defaults, etc etc.