Do you ever get the idea that you might be leaving money on the table.
As was noted above, we live in a free market society and everyone is free to charge what they want. It is truly a personal choice.
Renumeration has long been based on longevity based analogy. No one gets hired for a job and gets put at the top of the pay scale the day they start. However, when it comes time to services offering, you won't find that many companies that are charging 50% less than the median rates for the area (I use 50% as an example and this might not be too far off for some areas). John Smith starts a plumbing service, does he come in that far below his competitors. My niece married a plumber who doesn't even have his final ticket yet. He does some weekend under the table work and is about 10% what his full time employer charges.
If one is good enough to do photography as a job, whether it be fulltime or part time, then are they not in the league of the community where they could charge the median rates. There is always going to those that are atrociously expensive and those that are ridiculously cheap. We have a studio in the city that I work out of, it is in its 3rd generation (I think, its pretty close either way). Their rates are out of sight and they are booked solid for years ahead for weddings. I must admit that they do very good work though. Putting a personal thought process to service offerings (not necessarily photography but this could apply if I were a purchaser of this service) when I see something that is abnormally cheap I instantly think to myself, what is wrong with this. Does he/she not do good work, is the product relatively the same.
If one was to read through a number of threads in the wedding forum, there has been several debates about the weekend warrior shooters charging less. Some of them position themselves as being the saviors of the wedding photographer consumer in that they are doing them a big favor by bringing in lower prices and/or options within the deliverables. The certainly do bring a new dimension to the marketplace. For the sake of argument lets say the established studio is charging 1000.00 and the weekend warrior comes in and starts charging 500.00. The studio comes down to 500.00, the part timer gives a CD of high res images, the studio matches. What does the part timer do to bring a differentiating factor to the marketplace that separates them from the brick and mortar studio. At some point the prices and deliverables become ridiculously low and there isn't much, if any room for the weekend warrior shooter to move. The yield in the market has become too low for most to stay in it. If the studio owner can manage his costs so that he can stay in at these prices, where does that leave the part time shooter.
Competition is a good and healthy thing. I am not advocating that there shouldn't be any. Bringing new ways of presenting, selling and the delivery of the product is also a good thing. No one ever said that the studio owners knew exactly what is best for the market place.
I would just like to encourage the weekend warrior type shooters to have a vision of where they are going with this. Are they actually leaving the money on the table that they could have gotten in any event. You say that allot of work is coming from co-workers. What do you do when this work dries up. It is going to take more time investment to get the same amount of work. I've been exactly where you are as far as getting all the portraits in the office done. Are you ready to market yourself and invest the time and money that is takes to do this at the rates that you are charging today.
I offer this as some food for thought. Is there a point where we start to pay our customers for the privilege of taking their photographs.