Currency coinz vs blockchain coinz

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So, I don't really get it.

Coins that seek to replace or otherwise play some kind of role in "being" money - BTC, XMR Ripple, LTC or any of the other "bitcoin lite" version with fast tx times and low fees - make sense to invest in. They could reasonably be the "future of money".

But what about the ones that just make use of blockchain technology in a unique way?

For example TNT, as far as I can tell, it's just a way to immutably create Proof of Existence for arbitrary data verification purposes. Pretty cool/futuristic, but I don't see how monetary value, or any abstraction thereof otherwise, matters to it or should enter into the picture at all. Especially when its parent company holds hostage a significant portion of the coins in order to control the market a bit. Hell, even Ripple, which will try to be a sort of backend for money in large banks for international transfers, shouldn't theoretically go anywhere near the moon at all...and they have even more of a vested interest in controlling any possible mooning so as to play nice with the existing fiat currency system.

So why am I holding XRP, or one of those weird """gaming coins""" for online game items & assets, other than for pure speculation? Someone help me understand this.