Boring camera from a boring company.

nailed it

What do I charge? As much as I can possibly get. It's your job as a business owner to make as much money as possible. (while still delivering an excellent end product) We are all running businesses here, not charities. Undercharging yourself is undervaluing yourself helps no one.

Unfortunately there is no 'flat rate' as all clients are different and have wildly varying needs for their video. The biggest advice I can give is don't be afraid to walk away and avoid price based buyers. This is your business and it should be done on your terms. The client should respect your work and ability and both parties should be happy when all is said and done. If you have a relationship with the client and they value you as more than just a random cameraman, they won't have a problem paying more for their video. If a client is constantly low balling or trying to cut deals with you, they likely see you as just a commodity and you need to ask yourself if they are good fit for you. There should be mutual respect. Building relationships, trust, and delivering great work will allow you to set your prices on your terms you can feel good about.