I see a lot of companies such has ekmpowershop, volusion, eshops, prostores and so on that give customers power to build and customise their website (in detail). On the other hand I see companies such as RedTechnology (http://www.redtechnology.com/) that build eCommerce applications for customers. I had a look at How to decide between using an existing eCommerce solution and building your own? as well. Also you have big companies such as Amazon, NextPlc, that will never use the above service.
I would like to be self-employed in perhaps developing eCommerce applications, but I am a little reluctant as I see some comments "As with most Stack Exchange sites shopping recommendations are considered to be off topic as they become out of date so quickly". Also I am unsure of the amount of competition out there.
So would I be wasting my time building eCommerce application for customers? As I believe this will cost more from the customer's point of view and time constraint. In turn customers will be more favourable to the companies such as ekmpowershop, volusion, eshops and prostores?
Finally going back to ekmpowershop, volusion, eshops and prostores. How would one build those kind of applications? I am from .NET side.