I first heard about it when it was getting low-key shilled on this sub.
Number one reason I got interested is the white paper actually outlines how the protocol actually works and wasn't filled with buzzword marketing bullshit and hand-wavy half explanations.
XRB is actually simple enough that anyone with a CS background could get a solid understanding of how it functions in a short amount of time.
Actually more important than that is the fact that it actually exists and functions as advertised, unlike so many currencies that are just ERC-20 tokens with a nice website/roadmap/white paper/'partnerships'.
The team are also very forthright and communicative.
On the other hand the market is irrational and all CC investing is speculative and high risk so who the fucks knows,