|Back when I was younger 8-15 I used to open stuff up more often. I started building my own PCs by the age of 12 because of that. But not before breaking stuff or not assemblying it right and get screamed at by my dad.
Today is a little more challenging for the following reasons:
1 - I pay for the gadgets, so usually I won't risk ruining it if it's not broken
2 - Except for PCs, components get really small and complicated that isn't worth to just open it up to figure out you won't learn anything
3 - Risks of damaging the beautiful casing and voiding warranty aren't worth the possible benefits.
Of course, if it's broken I'll try to fix it myself before calling the guy. Recently, on the risk of voiding the warranty I opened up the top part of my brother's notebook to clean up spilled soda. I was afraid to damage those keys that were held by very fragile and thin plastic components. Good thing everything worked and he can type again.
I love to tear stuff apart, it's just nowadays the lack of time and the risks make it worth in very few cases, that's why I voted for "it depends". My next task is to try to recover my neighbor's hard disk, which fails to read anything (possible mecaninc components broken), but I look forward to it, as long as it does not interfere with my mundane pleasure of the weekends.