The only issue with demo trading and why all brokers offer BIG accounts t is they lull you into a false sense!
i treated my demo account like a live account and traded with the actual same amount i was going to deposit on a live account..
Whats the point of having a $10,000 or $25,000 demo accuont if you only have the funds to start with $500.etc.this is why most blow there small live accounts straight away as trading with a big demo account and using bigger lot sizes etc you get beginners luck and over confidence...Anyone can win with time on a big demo account as its mentally different , believe me there is no way you will trade your hard earned $500 or even $1000 like your big demo account ! .
BUT this is why brokers offer this so you get overconfident get some big lucky newbie wins on demo and then go WOW Forex is easy i am gonna kill it and then lay down your REAL money...but once you realise the wins etc cant be as big, you over reach and over leaverage to try and match what you did you your demo..Next min boom your $500 is blown and you go again! its all rigged against you so be careful people is what i say...
as someone said above better to leanr with a small live account!