What we do IS Gambling - just like poker - but just like poker, there are consistent winners and losers. To play poker well, you need to have and edge and understand the odds of various plays being successful. This is something which we struggle to work out in betting the markets. In poker, you can bluff an opponent sometimes by going "All in" - in betting the markets you can't do that.
Your strategy of micro accounts tends to mean you will win more than you lose numerically - and in fact you do have a stop loss due to your account size. Whether it is a valid formula for success, depends on whether yoou take money from the account when it is suffcient to fund your next micro accunt, or whether you just let it build up until it is lost.
Also the level you take your "wins" at will be very relevant.
The issue of where to set stops is always a bone of contention, and teh number of times you get stopped out only to watch the market reverse and continue in the direction you forecast is huge (or it is for me)
I tried your system once with real money and had to capitulate at -£1700 - I have never done it again. but I do use a small account and risk perhaps a third or a quarter of it in stop positioning for my long-term trades.