There is a "basic strategy" to blackjack that has been worked out by players and mathematicians for some time now. It varies to a small degree depending on what house rules you're playing under, such as if you can double down on 18, 17, what you can split on, etc. Mastering that strategy, and learning to count cards, and playing in a shoe with fewer than 3 decks, and where they don't shuffle halfway through, you can tilt the odds in your favor. However, get tired, make a simple mistake or three, easy to do, and you wipe out hour's worth of work. You rarely see a casino offer the game anymore under like 4-6 decks in the shoe, and they typically reshuffle it when they're only 2/3 of the way through, which really sucks butt. A couple casinos, that I've seen in Vegas anyway, have tables with only one deck in the shoe (it's really a "door crasher" special, they want you to move to higher limit tables), but the limits are sharply reduced, and as soon as they figure you for a player, you're out.
If you're not even counting cards and have "made" all that money, you're just lucky at the moment, and it WILL change.
I've played blackjack for over 20 years now. In fact, I worked out one of my favorite "negative expectancy" money management schemes playing it, which is a variation of the old "31" method, which is of course a variation of the "mother of them all", the Martingale. I hope to successfully tweak the method to suit my trading in a positive expectancy environment--I can see it reducing my risk exposure a great deal, albeit at the cost of some growth rate.
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