There are many problems out there that are not that apparent. Many times it happens that the consumers, the people for whom you are creating your product (or service), do not sense the problem. They don’t feel the need of that something which you think might make their lives so much better. There are numerous examples that come to mind. Take Lotus 1-2-3 for example. No one ever asked for a spreadsheet software. No one thought that they will be using one. Some smart engineers created it, some software savvy marketers associated a marketing need for it and today no information worker can live without a spreadsheet software.
The most important thing to consider here is how to make people realize that they should use this product. When you are creating product with a vision in mind to solve a not so apparent problem, the best way to go about marketing it is with the help of mavens. Find a set of early adopters who share the vision with you. Involve these people in product development. Talk to them. Listen to them. Make them feel a part of the grand mission. Give them the product at attractive deals. They will help you market the product further. They will make other realize that the problem your product is solving does exist and how the product is solving that and help you cross the chasm.