I agree you should not offer unlimited time....but I see nothing wrong with a one price for all events model if you do not have extras to offer. We do not offer different audio packages or lighting packages.....our system is the same no matter what the event / where the event is. We also do not do photobooths, monagrams, uplighting and things like that so why complicate pricing with event packages and other things?
I have been burned way too many times, my rates are determined by:
The location of the venue A long drive to venue? PIA to setup? (elevators, stairs, long walk, do I need extra gear, pay a parking garage?, etc)
Ceremony How much gear do I need to bring, Etc. Where will the ceremony be held? How far away is the ceremony from the reception? Is there electricity available? How many mics are needed? do I need to patch in a keyboardist? electric guitar, etc.)
Music for cocktails in another location Is there electricity nearby?
Do I need to hire an assistant?
What time are the guests expected to arrive?/what time do they need me there by? I'm not going to set up 3+ hrs beforehand & wait to play. (some may want your gear in early & not start for a few hours)
Do they need any editing of music done? I have had many brides that want songs to start at a certain point, or bridal party members each intoduced to their own music. This needs to be prepared ahead of time.
Backup plan for outside gig in case it rains? Will I be needing to provide my own tent/cover? or will I be setting up multiple times in various locations?
This month alone, I have 8 wedding gigs, all of them require 3 separate setup locations (ceremony, cocktails, reception) One of the ceremonies, I need to bring 250 ft of AC cord (to nearest outlet) at another wedding gig, the cocktails are clear on the other side of the resort. Another one involves a nightmare of a load-in/load out. No vehicles allowed, a long walk & it involves elevators & walking thru slippery kitchen areas.
I knew a DJ once that quoted someone a price, (it was low) and then found out later, he was responsible for providing the power (no AC available...he needed a generator) He wound up losing money on that gig because he had to rent a generator.