OP, I vividly understand you, but gamblers don't think this way, note the idea of a gambler is to win despite that most of them know that losing is inevitable in gambling, some gamblers see winning to be a constant thing in gambling but that's is high level of fallacy, gambling has principles and these principles must come to play, it is normal for a good gambler to have it in mind that gambling is not a certain event so that when you gamble, your expectation shouldn't be one sided, you should reason in different direction which is the aspect of failing to retain your stake or getting your stake back with profits attached.
The gambler get into the gambling in the way of getting the winning dollars in the gambling site.The gambler should ready to face the gambling loss when they have the negative side of game.The gambling doesn’t have the constant win or loss in the game,the gambler should ready to face it.The gambler who use the strategy to win the game will able to win the good money in the gambling.The gambler who use to bet in the random way without any stable game will loss the funds at the end.Many gamblers will do this mistake in the betting,the expectation in the gambling should be accepted in both the positive and negative way.
I am somehow confused on your statement but let me try to breakdown on what you just mentioned.
First, the gambler who utilizes different strategies depending on the game does not give you a guaranteed/absolute win but it does increase the chances of you winning. For example, in Poker, if players employ different techniques (e.g. bluffing, etc.) then they may be able to turn the tide of the battle even with a weaker hand compared to others.
Second, a gambler that does not employ some kind of tactic or just bets in a "random way" may indeed lose money but this is not always the case. Let's take slots as an example- the only thing that you do there is to push the lever and pray that you win. No matter how much technique you put into it, the result may vary depending on your luck as it is irrelevant.
Lastly, I do agree with what you mentioned that in the expectations of gambling, it should always be a two-way street. This means that either result can be experienced by the average gambler no matter how lucky/unlucky they may be in a single run.
In conclusion, I do think that gamblers should have a reasonable expectation when they delve into this activity. There is nothing absolute nor guarantee in this game- it's either you win or you lose; and the steps that you take after such result will determine your success/lost in the long run.