Probably more profitable right now than mining Particle, anyway..
You probably better of "mining" Ripple and do some good for the community by donating processing power for cancer research or other projects you can choose at the World Community Grid
I used to use Boinc and folding@home for spare processing power. I'd probably prefer something like that set up on my Rasberry Pi when I have it up and running, though. I have no idea how Ripple works. It sounds a bit shady.
Ripple I suppose you could debate all day long i would't go out and buy any, but i am getting them for free so to speak. I use a stock standard of the shelf computer running 24h and help the guys research cancer I get some ripples for it. The electric used helps with heating so its a win win win. Ripple seam to do alright they are right behind Bitcoin at marketcap and hopefully prices rice too, so my effort was not just for a good cause.
If I am not mistaken - the reason Ripple has such large market cap is that it was 100% pre-mined by a company, so you cannot "mine" Ripple, only trade it so don't compare its market cap with other coins that are being mined. The company is releasing Ripple slowly, never giving more than 50% to the market to protect from someone else taking over (or so they claim)