It has nothing to do with using ripple - you just need 300xrp to make hundreds of thousands of transactions in whatever currency you choose, including bitcoin. You just need to trust the gateway you use.
xrp is a bad investment by design. you only need a trivial amount of xrp to use ripple.
You don't need to invest in xrp to use ripple.
This doesn't change the fact that Ripple is nothing more than a vehicle to make the founders millions of dollars.
How? xrp are clearly worthless, so how will they become millionaires?
XRP are worthless, yet the stated purpose of them is as an anti-spam measure. For them to work as an anti-spam measure, by definition, they must have value. So which is it? Are they worthless or are they an anti-spam measure?
Give me your ripple address and I'll send 300 for free - enough for a lifetime of use. It's a waste of my time but worth it to make a point.
If you have enough XRP that you can give away 300 just to prove a point, seems like you would stand to make quite a bit if XRP succeeds.