If you can afford to lose it, then yes. Many believe that bitcoin's future is something of a binary proposition: it will either succeed wildly or will completely fail with little in between. Likewise, many people believe in the "succeed wildly" scenario for many, many reasons, but that is no guarantee since no one really knows.
You can view it as a lottery ticket that seems right now to have pretty good odds for paying off quite well over the long term.
Im thinking of sinking 2.5k into buying BTC. I know you cant tell for sure but do you think its a good idea?