You have beautiful hair. If you're not ready to cut it, and are mainly looking for the money, you should definitely consider the modeling and photo options presented by others. Beautiful hair that long is pretty rare, especially if as you say it is longer than the photo.
But if/when you are ready to cut your hair for a change, as most women eventually choose to do, you shouldn't be ashamed or be made to feel bad by long-hair lovers. Long hair is gorgeous, but the dramatic transformation from very long to short is amazingly intense and beautiful. IMO the act of cutting off long hair, because it is so stark and final, is one of the best ways to show off its delicate and fleeting beauty. For me, some of the best long-hair photo series end with a bittersweet shearing of the hair. So from an artistic standpoint, you might consider sharing the cutting with a photoshoot or video. You can make quite a bit of extra cash selling copies of the video to many who could not afford to buy your beautiful hair outright.
If you are interested in selling your hair, you should check out these two sites for an idea of what you might get and as a possible marketplace:
Check out the merchandise section of thehairtrader.com to see two gals who have had good luck with selling DVDs of their dramatic cuts.