You people are the problem. You are unable to answer what is bitcoin and what I actually get after buying it.
Of course, people are the problem. You're right and everyone else is wrong. You can't understand that something which is not tangible can be utilized. The answer you're looking is on the main page of Bitcoin's wiki:
Bitcoin is P2P electronic cash that is valuable over legacy systems because of the monetary autonomy it brings to its users. Bitcoin seeks to address the root problem with conventional currency: all the trust that's required to make it work -- Not that justified trust is a bad thing, but trust makes systems brittle, opaque, and costly to operate. Trust failures result in systemic collapses, trust curation creates inequality and monopoly lock-in, and naturally arising trust choke-points can be abused to deny access to due process. Through the use of cryptographic proof, decentralized networks and open source software Bitcoin minimizes and replaces these trust costs.