I used to gamble with 10k satoshi each bet and put a 1.3x odd winning, it usually won and whenever I lost I actually x10 my bet and put 100k satoshi which meant I usually recovered and also made even more, now sometimes even that failed but I was making decent amount until one day I lost 3 times in a row and that emptied my whole bankroll. So, something that worked for me for weeks actually ended up costing me a lot with just one bad streak. Its not a great idea to use others strategy because it may not end up working out for you.
Winning a wagering contest and winning money with your gambling are two different goals, and one shouldn't mix up them. You lost your whole bankroll because you set 1000% increase on loss, and no wonder that 3 reds in a row drained your balance. But when you are trying to win a wagering contest, you shouldn't increase your bet size on loss. Basically, you accept that your profit is going to be negative, but you'll wager much bigger amount with the same balance, and will get a prize.
For me, he is not mixing two goals here. He is just trying not to lose too much while competing for the wagering contest. If he tends to play fixed flat amount all the time during the contest then he may lose more, that's why he mixed the strategy in order to have better statistic during the contest. Obviously the risk is indeed bigger if he increase the bet amount, but there is also a chance for him to recover something that he have lost while wagering. All in all, it is all about preferences while someone is participating in wagering contest. Some players prefer to have flat bet amount and some others prefer to have mixed strategies.
doesnt mind too much on how much he do wager, he would still end up those statistics because the only common goal in mind is on how to last longer
while we do play neither you are aiming for the competition or not.