What is your "inexpensive" hobby that turned out to be expensive/ you gradually invested lots of money into?
Edit: so it turns out that every hobby can be expensive if you do it long enough.
Also I love how you talk about your hobby as some addicts.
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Marginal gains. Expensive marginal gains. I'm glad I'm not into that. When it comes to saving weight it is far better for me to shave it of me rather than the bike. And cheaper too!
In my opinion they aren't even gains. Making the bike more efficient just makes it less exercise efficient. You have to bike longer to get the same workout.
But it will run quiter. And I can attack KOMs harder. Et cetera.
But yes for working out a watt is a watt is a watt
Upgrading the drivetrain can make sense. Perhaps the brakes. Shocks if you are mountain biking. But no one needs a carbon fiber frame unless they are competing.