Sure, and I didn't mean to imply otherwise, but correctly evaluating the situation is still important. The cost/benefit does require evaluating the benefits, and the benefits actually play into the costs as well. If being sedentary is harmful and standing all day isn't a good solution, then it would be harmful to adopt a standing desk instead of exercising.

For my part, my week with a standing desk just led to upper back pain (which is not unusual for me, but I am generally able to avoid).