Of givers and takers

When a giver gives and a taker takes
When a giver always gives and a taker always takes
Will there come a point in time when the giver grows tired and well...gives up?

Why would the giver feel tired after awhile?
Because he is discouraged by the lack of reciprocation?
That things are always going on a one-way street?
Would he feel better if he did not expect anything in return?

The more you expect, and when the more you don't receive..
The more disappointment you'll get
And the more you'll grow disenchanted

Then again, how many of us can say we are selfless beings?
Prone to giving our all without expecting anything back in return?
I suppose it's part of human nature..to hope to get something in return..
Even when you give a dog a pat on its head, it wags its tail in response..

And so the cycle continues..
You give..but you don't get..
You grow tired and give less..
And when you give less, you get even lesser..
And when you get even lesser..you grow more tired..
And yada yada...
Is this how we've grown into a more self-centered group of people?