Here's a thought for today: It's interesting showing work to non-photographers because their reactions are purely about emotion and content. If you only show your work to other photographers and imaging professionals you may be missing out on important feedback.
The greatest reward is when the audience you took the picture for likes what you've done. If you take pictures to show them on image sharing sites then that is your audience - mostly amateur photographers. If you take pictures to sell them then your audience are your clients or the consumers of the published material.