I've never studied a constructed language, but a few years ago, I read an essay on nouns in Klingon by Marc Okrand, the linguist who created Klingon as a language with syntax, grammar, etc. He'd done scholarly work with Native American languages prior to that.
After looking just at Okrand's work on Klingon nouns, I was amazed by the amount of detail. In his Klingon noun suffixes, for example, he created a suffix "-qoq" to mean "so-called." The example from the essay is that the Klingon word roj ("peace") can be modified with the suffix "-qoq" to become "so-called peace." Adding a small suffix makes the difference between "peace" and a "so-called peace" that the speaker doesn't believe exists or perhaps doesn't believe will continue.
I enjoyed reading that essay on Klingon nouns, and I think if I were very involved in a particular community already, I would be more interested in studying a constructed language. In other words, if I were already a Trekkie, learning Klingon would seem more fun. It's a language belonging to Trekkie culture, and I don't see myself getting much into Star Trek beyond what I am now.
Have you (or anyone else here) seen the movie Arrival (2016)? The aliens don't speak because they're squid-like and evolved to communicate via ink-writing. So it's a constructed language solely based on writing. At the time I saw the movie, I'd been thinking about how some languages are written left to right horizontally, others right to left horizontally, some right to left vertically... and I'd been wondering what other writing configurations exist/existed. Arrival was a great movie for that line of thinking!