Primarily,building connection with other intelligent species with humans'current technology does require an incredibly high cost. This is to say, tremendous funding ought to be utilized for related technologyresearch and the establishment of some certain facilities, instead ofbeing used for solving some livelihood problems on the earth. Even though mankind is trying to set up a connection with aliens who areliving several light years away and are obviously less civilized with less advanced technology, due to the limited space technology that humans currently have, we would be able to do nothing further.Investing billions of dollars for saying hi to someone who might not understand at all is definitely not a wise decision.  

Worsestill, unknown creatures that receive humans' greetings may be more advanced and intelligent than inhabitants of the earth. What will happen at that time is more likely to be what people often see in science fiction movies nowadays. “The White House” is being attacked and Air Force One is shot down by missiles from unidentified flying objects". Intelligent species might not be willing toco-exist peacefully or harmoniously with other creatures whose civilization apparently lags way behind. Their greed drives them touse war to make the earth their colony offering whatever they need from this planet. If that happened, humans would be extinct, and the only survivors would live their lives in the zoos of those aliens.  

As it is mentioned above, possible outcomes of sending message to unknown life forms somewhere in the universe are what we humans cannot afford, nor what we cannot accept. Therefore, space technology is not what we should spend money on, as paying for the risks is never worth it.