Hi I am from Finland(north of Europe). Sorry my bad English.
In Finland there is like 3 company's which can live with doing music videos. Music video business is very low here. We have one Tv-channel and of course internet. There is same problem that people don't understand what all cost. When they watching Americas music videos they see only the beautiful pictures, cars, lot of extras and effects. There is lot of good camera mans and directors like some where else, but those band's and small record company's think that if they pay 400 euros they get american dream lol. In Finland one camera man for day pays more than 400 euros. I am talking professional guys for 10-15 hours. Then it's suck if the band aren't happy for the final result and they can make you life hell. Want more extra filming days or effects or other things. One time I was have to film half video again be cos the shirt wasn't good. I did it be cos I didn't wan to that my reputation goes. Worst case they ask money back. Then you are like what did you think that you get with those money. Its hard situation. I was making today commercial one orchestra and when shooting was over the boss ask me is it Monday ready. I laugh and sayd that the post production takes time like 100 hours work and he was like what! It is very hard to understand for people who don't know anything of film making. Its not only import, klik klik and then its ready. I think that it is okey to get less money if the band is helping with producing like get cars to transport stuff and people, get locations, helping with the props, catering, asking extras and other basic things. Invent the story take lot of time. Its better if the band have some basic idea.
Here I don't see that people do it for money. Its more doing something else than those fucking reality tv-shows lol. If you are using your cameras, dolly's, lights only for making music videos I think that you don't get newer you money back using them. Okey some parts newer go old, but I think that way.
I have made couples of videos for friends and been helping others couples of times. There is always all most all people for free and the camera equipment are rent for other production's or borrowed to the music video shooting. I don't see any business potential here. Many schools do half of those music videos be cos there is people and stuff all ready. It is cheap to put school to do it. I think if you going to live doing music video you have to ask more money. You can 1-2 times ask you friends to help you do the videos, but not every week. If you have higher price you do list of what it includes. The story modify the cost, but the basic thing is the same.
Make basic list of thing that you need. Do you all ready have it or do you need to rent it.
I don't know the prices of your county but.
Camera and equipment's (rent) 500-600 euros( if you have it you can lower the price little bit)
lights and cables 2500 euros( if you have it .....)
Editin 150 euros(for hard disk and if you computer brakes you have some money to fix it)
make up 100 euros( if you dont have anything special)
Paychecks for 5 people 1200-1400 euros (600e for you becos you do the editin and get in bands. 200e to others)
other cost food, gasoline, etc
insurance for you camera stuff 100 euros
If the location is studio it cost more
then it is something like 5000 euros
but you have to think that you can do the music video in 1-2 veeks and then is it like 4 videos in month.
2400 euros for month. Some times there is not so much work and the realistic month pay is like 2000 euros.
In Finland normal pay check for cleaning and ware house work etc is 1600e - 2000e. You can think is it enough or do you need more. The differense is that the regular worker do 40 hour in week, movie maker do
more than 50-80 for week.
but if there is money 15 000euros is good price. With that you get professional actors, better color grading if you are not the best

You can get better shooting location or props and more time to make effects. You can get more people to work and then the days are not so long.
or you can forget all that and ask what is the highest price that they can pay and live it