Why should you buy Polkadot?

Polkadot, eh? So, why should I consider buying it? It's just another crypto, isn't it? I'm not quite seeing the big picture here. Could you paint a clearer picture for me? I've heard it's some sort of blockchain interoperability platform, but what does that really mean for me as an investor? Is it going to revolutionize the finance world or just another flash in the pan? I'm looking for solid reasons to part with my hard-earned money, so please, tell me, why Polkadot?