I know that Ethereum has greatly increased in price over the past year, but you must thoroughly examine the cryptocurrency market in order to understand when it will be profitable to buy this cryptocurrency or sell it. To buy Ethereum, you can use different payment systems, but I know that the paypal sometimes blocks accounts due to the purchase of cryptocurrencies on unchecked exchangers. You can always buy a cryptocurrency from your bank card. For example, here
https://btcbit.net/buy-ethereum-eth-with-credit-card , it's a reliable exchanger with a good reputation. You can buy Ethereum for up to $ 30,000. Also on the website there is an infonography of the cryptocurrency rate, so that you can see when it's best to sell this cryptocurrency.