1. I presume that the capital costs of infrastructure in creating a new ISP are significant.
2. Most of the larger markets are in densely populated cities, which makes laying infrastructure even more difficult (there's a reason that Verizon rolled out FiOS to suburban areas rather than urban areas).
3. If your 'value added' is something that the ISPs can easier undercut to drive you out of business (e.g. expanding bandwidth caps, increasing speeds), then your business proposition becomes even shakier.
2. Most of the larger markets are in densely populated cities, which makes laying infrastructure even more difficult (there's a reason that Verizon rolled out FiOS to suburban areas rather than urban areas).
3. If your 'value added' is something that the ISPs can easier undercut to drive you out of business (e.g. expanding bandwidth caps, increasing speeds), then your business proposition becomes even shakier.