How can you gamble without money. Money may not be everything but you need it to gamble. The main motivation behind gambling is excitement of winning. That thrives people into gambling more and more, again and again. It is just a happiness of 5 minutes but lots of people die for it.
You can gamble without using any of your money but you must bet a valuable possession of the same value that the other person bet. The truth is we don't need to gamble our money, we can use to bet our things that we don't need, but we also need to think what may happen if you do such thing.
basically you can always gamble anything that has a value .
but the real point are not about that i guess , people keep saying that you can gamble for entertainment only. not just about chasing for profit and get additional money. an entertainment for those people who love to gamble are the moment when they win it. so money are so important here i guess.