I'm not Moemg, but maybe I can try to answer your question.
Someone on this thread said they would use the responses to evaluate whether or not they were spending too much or too little. It sounds like this is something you don't get or agree with. I don't get it or agree with it either, but such [-]stubborn[/-] [-]obnoxious[/-] individualistic thinkers as ourselves are rare gems of this universe.
There are other uses for the data, however.
1. Personally, I really enjoy these budgeting threads and reading about how much people spend on what, how they pay their bills, etc. So it is free entertainment for me to read and reply to these threads.
2. Occasionally I will gain a new insight into financial stuff by reading about how other people do things. (This doesn't happen as much any more, but it still does happen on occasion.) Either I will read about a new tool (like Mint), or a new bank (like PenFed) or a new way or method to do something (like how I handle my passwords, or how I pay my bills) or new concepts (4% rule, buckets of money, investment allocations, Bogleheads, etc.). These insights either lead to better (more efficient time-wise, or cheaper, or more fully-featured) ways to do things, or they lead me to a better understanding and acceptance of myself and my financial situation.
3. I figure if someone else is asking me for the data, and I enjoy sharing some of my data, it may help them out...so I share. I like thinking I help people out here sometimes just a little.
HTH,
2Cor521