i have seen some scalpers that are brilliant at it and make a fortune and some that are not and bust their accounts time after time. i think it is like all types of forex trading in the sense that it is risky.
it is not for everyone. i myself am just starting out and am very interested in the scalping side of trading, i only have a demo account but have been back testing using a simulators with some degree of success.
dont let other people put you off it by saying it does not work. there is always someone that claims that something does not work you get that in all walks of life. what works for them might not work for you. if it was as simple as does this work then one person would have made a good system and anyone that traded forex would use it and we would all be millionaires. everyone sees the market differently hence the reason you get the winners and losers. i have not found out which category i am in yet as i am a newbie to forex but i am determined and willing to learn. the best thing to do is to keep an open mind if you think your onto something then research it and try it on a demo account account or backtest it. whats the worst that could happen.