>And until the data is in, it's impossible to know how productive it might be. If you know how much you spend on clothes, you do have a cap on how much you can

>And until the data is in, it's impossible to know how productive it might be. If you know how much you spend on clothes, you do have a cap on how much you can save. If that number is not huge, and the results non-obvious, then you really can conclude that it's a waste of time. Moreover, if you have lived a long time and experienced a variety of different clothes already, the data is likely to just confirm what you thought was obvious. If you are in the business of making clothes, then the situation is different. You may be trying to optimize a design and thus experiments in your own life could be helpful. But even then, a lot of things are pretty obvious.