In reply to Fraser:
Controversially, perhaps 'expensive' is the right word to use. I'm sure that people like Niggle are able to produce much higher quality work than most, if not all amateurs. On the flip side though, the advent of very high quality digital SLRs has made photography a lot easier than it used to be.
Various technological improvements like high iso performance and the latitude offered by RAW shooting etc, etc means that the skill set required to get shots which are 'good' has reduced to the level which is easily acquired by the keen amateur.
To make it concrete, I am an amateur photographer and spend a moderate amount of time on it (less than I spend on work and climbing). Ocassionally, as a favour to friends i will shoot their wedding for a fee which is much less than a professional would ask. I do an OK job; the images won't win any awards but I think I reliably hit the middle of the quality range offered by the pros.
Because photography is just easier these days, I imagine there are many, many amateurs who would do a better job.
In this climate, isn't it right that 'quality' photography is now worth less?
Put more bluntly; we used to pay big whack for pro photographers because they'd learnt a skill set that made them valuable. If you are at the top of your game, this is still true. If you are a 'jobbing' pro perhaps it isn't?