I've never heard of ripple before the GP's post, any particular reason why you consider it a scam? After all, many people consider bitcoin to be a scam as well...
Bitcoin itself is less of a pyramid scheme than gold. This is because even when the price stops to rise (or even when it collapses) you can use it to easily transfer value across the world.
I won't, ever, be buying bitcoins for this and other reasons.