no, it does not, you jus keep different templates, for yahoo finance it maybe extra 100 files. I worked for the small company and we managed it. Basically, you have 1 web site, you just define via "user-agent" a type of device requesting the web site and present the website in the corresponding template.
No extra expenses at all.
The problem with big companies like Yahoo is that there are huge number of middle men between developers, customer support and decision making management. Many often these middle men have no clue what is going on and "their main job is to keep the job" - show his/her position's importance. As the result, the decision making management has no idea about customers needs nor they have clue about developers recomendations.
