What I understand which has made me give up:
Ripples are pre-mined and possessed by a central company
Just like frequent flier miles are handed out by an airline, prepaid minutes are owned by a phone company, or stamps are "pre-mined" by the post office. You're free to use it as currency, but keep in mind that they're basically just future transaction fees (the number of transactions one XRP pays for isn't 100% certain either, since it depends on load).
Seems like someone is trying to make money off me
They are trying to make as much money as you're willing to pay for the convenience of using the system, while at the same time not killing it by over-pricing their services.
I received no roi on my hours of research and I am cranky
It's still in beta. It took many years before my PGP web of trust expanded to be useful enough that I could communicate securely without having to do a precursory key exchange. It was still something that I learned from and that I could write credit-giving essays and papers about.
Ripple's main challenge is to get a critical mass of gateways and IOUs going, as well as overcoming legal issues. The basic protocol itself appears sound, though there might be bugs hiding in the source code, so look forward to that getting released.
XRP shares some features with Bitcoin though, as well as other stocks and commodities, and one of those is that if you believe that Ripple is going up, feel free to invest, but that if public adoption fails, be prepared for a crash to near zero value.