Polkadot blockhain now is actively used for staking because the commissitons in Polkadot is smaller than in Ethereum and it allows to connect Polkadot with Ethereum. More information about Polkadot staking https://polkasyndicate.medium.com/hello-world-d6cf5ede486.
The appear of parachains will increase the liquidity of the Polkadot. The price of Polkadot will grow in future as ecosystem of Polkadot growth.
Now the commissions in Ethereum are very high, that is why Polkadot blockchain is so popular for use and because of big volatility it is actively used for speculations.