Demo helps you take off the risk of losing as a beginner, it helps you perfect your trading strategy before you can move to a live account and start implementing all you have learnt then start profiting in no time. You can't take away the importance of demo which is something the cryptocurency industry are yet to understand. Most well reputed exchange don't have demo where noobs can practice but I'm not surprised, they're just interested in the profits they make instead of carrying the community along.

Demos aren't waste of time and most professional today will tell you the same (this doesn't mean I'm one of them though). Demo offers you a platform to test all the crazy ideas in your head without the risk of losing a cent, if you call that waste of time then you need to put your emotions in check because your taste for quick profits could cause you big time. You have to be patience with the process, first you learn then practice before you start live trading.