@Sander - Let me answer your question. Marc is onpoint when he says, it isn't about how saturated the market is but how well you sell/market your product. If you see most successful businesses, have products created from needs. Recently I was watching SharkTank (yes, I'm hooked to the show like a zillion others) and noticed how funding is being provided to folks in hundreds and thousands of dollars for simplistic products like plastic water bottles. Ofcourse, funding is a product of multiple factors. But the investment pros sitting there are successful people. So for them to put in a $ means getting at least 2$ out of it. All this by selling plastic waterbottles with an top and a bottom opening :)
That gentleman had 3 offers and had already grossed sales of about 750K :)
So cheerup my friend...There is always a market for every product we sell....It's the story of longtail....something you might have heard... Please let me know if I can help in anyway. I would be happy to answer any specific questions you may have to the best of my abilities..