I hate hearing described this supposed "10,000 hour Malcom Gladwell rule". There's no such thing. Gladwell has long been trying to explain that the 10,000 hour rule was not a recipe for success, only a requirement for mastery. The fact is that mastery is no guarantee of success.
And lately, Gladwell has been giving a much greater emphasis to the notion of love for what you're doing being a more direct quality of those who are successful. And it's more than really just "love". There's an element of intent and desire and yes, love. What made Michael Jordan shoot free throws for hours and hours after it had gotten dark when he was 12 years old? And continue to do so when he was 27 and already a world champion? Why did Charlie Parker disappear for three years and practice 13 hours every day after he had been so badly embarrassed on the bandstand for not knowing how to play in more than one key? Part of it was his desire to "show those guys" after his earlier failure. And part of Michael Jordan's incentive was his famous (or infamous) almost pathological competitiveness. But those things are never enough. Because spite and desire can only take you so far, and they both have negative effects. They'll eventually eat you up (as may have been the case in Bird's example, because clearly his drug use and self-destructiveness would seem to indicate that something was eating him up). But to put the time in requires love. Doing something because it's something you can't imagine not doing. Because that's how you see yourself - that's who you are. The possible financial rewards are not nearly certain enough for that to be the sole motivation. I will bet that Michael saw himself as a basketball player and Bird as a jazz man well before they were on their way to success.
There's no guarantee for success, but there are recipes and the ingredients are often kind of specific. The good news, is that if you really love doing something, it improves the chances the recipe will be successful. Kind of like garlic and butter. There's no guarantee that a dish will be delicious, but if you start with garlic and butter, the odds improve, you know?