Your endusers may not care. Not directly. But they'll care when your site has problems or is slow. This part, in turn, is heavily influenced by the quality of engineers you have behind the scenes, and the choices they make. The nature/quality of your engineers will be influenced by what kinds of technical choices are in place at the time you start trying to hire them on. As a general rule, for example, a LAMP stack is going to attract a different mix than a Microsoft stack would. Lisp will attract different than PHP. Therefore, tech does matter. Does it matter as much as making a product people want and are willing to pay for? Probably not as much. But if/when the time comes and you want your site to scale, or have lower problem rate, then your engineers and your tech are going to matter.