Right, but you have to acknowledge that a budget at that level is limiting in terms of experiences. There is no leaving Tokyo at that level. That's 3000 Yen a day. You aren't going to any non-free temples, seeing Kabuki or Sumo or a baseball game...you're not eating in any good restaurants or doing a day trip to Nikko or Kamakura...and certainly not taking the train to Nagoya or Kyoto (unless you aren't including a JR pass that you bought before you left)...
i.e my Shinkansen costs on my 13 day trip are going to be 70,000 Yen just by themselves (Tokyo-Nagano, Nagono-Tokyo, Tokyo-Kyoto, Kyoto-Hiroshima, Hiroshima-Kyoto, Kyoto-Tokyo)...
Certainly we all have to make our budgetary decisions on what matters and I am actually impressed that you can spend a month in Tokyo at 100K but, for most tourists, that amount isn't enough to see/do what they want...