Relfy, If people are asking for your pictures because they feel they are good enough to help promote them then they are good enough to sell... I am a bit of a strict person when it comes to companies using my creativity to sell or promote their products, even charities. I know that sounds harsh, but I look at it this way...
The person writing the articles or creating the website is getting paid, the art director for the project is getting paid, the head of the company gets paid, even the cleaners in the building are getting paid so why not me? I have a house to run, people to feed ect... so why work for free?
I've spent thousands and thousands on training, equipment - not just the cameras, but lenses, flashes, cleaning products, memory cards, filters, modifiers and lots of other bits and pieces. I've spent thousands of hours learning an working at my craft, I've spent thousands on computers and lightroom and photoshop and many many more hours learning how to use those programs to their full ability.
And then they ask me to take all of that time and money and give them my skill and creativity for free.
You say that your camera isn't great... so what? It's your eye, skill and time that create a picture, not the camera. Okay, so if you show up at a paid job with a Canon rebel it would be seriously unprofessional and I would seriously recommend against starting up a business until you had the proper professional equipment but for the shots you already have, why not ask for something?
If it's good enough to be printed, it's good enough to be sold.
Decide on what is fair recompense, I have a set amount... use this site below to discover your cost of doing business - this will be the minimum you need to make to keep even, add some more on for profit.
http://www.nppa.org/professional_development/business_practices/cdb/cdbcalc.cfm
It's in dollars, but if you just ignore the symbol it won't matter.
NB: You NEVER sell copyright, only license to use the photo.
eg: License for use 1 year - print run up to 10,000 - 1/8 page. After the year is up, they have to give you more money or discontinue the run.
Well... the only thing is, I don't think that's strictly true that everyone gets paid when its charitable. I asked one girl and she said 'no she is a volunteer and as a new venture no one is getting paid yet'. It was a green website, can't remember who, but the article she was writing was sound re water wastage.
Also - I haven't spent thousands on camera equipment. I'd like to!! But so far... only about £200 (including memory cards etc) and I've completely abused my camera until its nearly not functional anymore, but then it is earlier photos that people like anyway.
But I completely agree every worker his wages!! And completely support you in expecting that. If I was doing what you do, I would expect it too.
In the end, I haven't actually let anyone use my photos - not because of the money but because I don't want to undercut the market for everyone else - or the future 'me'. I was going to let the girl with the water article use one because I felt proud of it and thought it would be good advertising (for me) as long as she acknowledged me - but by the time I replied the article had gone to print and I was relieved in some ways, which is why I said no to everyone else, well, discussed the ethics and then said no.