Thanks for all the replies.
I trade the Dow, Dax and FTSE indices, which have plenty of trends both up and down every day, even in a bear market as we seem to have at the moment.
I trade mainly 5 minute bars, like Trader Tom, Al Brooks and a few people who post here who seem to have some success at it, so a 20 minute trend is not out of the way. Some trends actually last all day.
I am certainly not expecting to trade for a living, as I run my own successful business, which I think is good idea for anyone embarking on trading, as there are some similarities. It seems obvious that before even hoping to trade for a living, you need to be able to trade successfully and consistently with small sums, which I think is very difficult. I am not convinced that many people who post regularly here do that, though many talk a good game. Also if you are in the mind set of having a regular income, that seems to me a problem if you want to trade for a living, where a regular income is tough even for very good traders.
One advantage of day trading, if you can do it successfully, is that it is eminently scalable, which is often a problem with other types of business which face fresh problems when you try and scale them up. For trading, you ‘simply’ increase your position size, which though it may be psychologically difficult, should not be impossible. For a ‘real’ business you probably need to employ more people, increase market share, have larger premises, follow tougher regulations and a myriad other problems. By comparison, earning a living as a day trader would be very straightforward, though not at all easy as most of us here know.
The comparison with roulette is to show how probability works, not to imply that it is the same as trading, though there definitely are similarities. You need a method that shows a consistent expectation greater than zero, and that is hard to find. If it was easy, we would all be millionaires living the high life, not spending our time posting on an internet forum.
Trend following has its problems of course, chiefly in working out when a trade starts and ends. Range trading has its problems in that ranges end with breakouts more often than we would like. None of it is easy; everyone must find their own way through.