The price of Bitcoin rose 5% today, the Ethereum price dropped against Bitcoin for about 15%. The volume also reduced.
I will keep on buying to achieve 1500 Ethereum coins so that I can earn interest from staking. But I think 1500 is too high value.
Right now to reach 1500 eth seems hard, at least for me. From where did you get that information?
Ether is still PoW, has not changed to PoS yet. From reddit:
In CASPER, there will no longer be any miners. Rather, any entity (an individual or a group (such as a pool)) willing to put up at least 1500 ETH may become a validator. Validators are randomly selected to produce new blocks, and the other validators bet using their deposits on whether that block will be the final block. For this, validators receive both transaction fees and, possibly, a small subsidy of new ETH.
In the current, PoW, system, you can believe a block won't be reverted if more miners do calculations on that block's chain than any other. In the future CASPER system, you can believe a block won't be reverted if enough of the validators would lose their deposits if they turned out to bet wrongly.