If your stupendous market photos are going to sit on your hard drive until doomsday and otherwise never be seen by a living soul then who gives a fig?
I agree with this wookie, and I am sure many others here do too. I am certain we are all/have been guilty of valuing our work based on the concept of "one day I might like to make some money from it".
I am sure many of those who have had this thought will also agree, sometimes its a long time coming.
I am not saying we should all give our photos away, neither am I encouraging the theft of copyright to entries submitted for competitions.
Rather, we all need to be sensible and put a realistic value on our own work. Its been some time since I was even a semi-pro (so my point may be moot), but I would always categorise my photographs as follows:
A) Those I thought I come make money from
B) Those with little chance of making money, but might still have a crack at winning a competition
C) Those I would "share" for the purposes of demonstrating techniques or faults or in recent years for sharing in online galleries
If I enter a competition I usually go out and take a photograph purely for the purposes of that competition - by doing this I feel I cannot attach any further monetary value to the photo - if it really is outstanding then I will keep it myself and enter another.
I remember selling a photo of the Vulcan bomber when it last flew (back in the 80's) for a centre page spread in a magazine and it made me £120 - only to find a similar photo winning in a competition for an SLR kit worth £500 (thereabouts). I never made another penny from the Vulcan photo!!!
As for my own competitions... I never ask for copyright myself and in fact place copyright notices on all images after the competition has closed. A couple of times publishers have contacted myself for entrants details who have then gone on to be paid for the use of their work.
I cant remember the point I was gonna make now, so... If you really are making a living from your photography that you need to protect then DONT ENTER COMPETITIONS, otherwise enjoy the competitions - and who knows - one day you might even win one.