It's their choice anyway, to buy BTC. I can see some reasons like, they arewilling to spend money just to add butcoin in their savings and then they are going to sell it soon as the bitcoin price increases.
Bitcoin is a volatile and decentralized digital currency. It is not a great asset or investment but we all know how it may move that it can give us good profit.
As long as people know that the price of Bitcoin will increase, no one will be able to stop the people, the investors and the users from buying Bitcoin. Now that the price are slowly going up, more people will buy again bitcoin.