well you ask Christ that.
Remember, Christ said that His Kingdom is not of this world, so when He was arrested His Father would not send down angels to His rescue. He was mocked because of this display of ‘weakness’.
In the ‘weakness’ of the Eucharist Christ’s glory is shown to those with a listening heart.
(btw... Paul also talks about sins against the Eucharist as sins against the Body of Christ)
Now, from my point of view, it is just bread and just wine and the significance is in the condition of the heart of the recipient.