Is this minifigure with a white shirt showing a little orange monster worth anything?
The whole minifig assembly reminds me of of those services that allow you to print your own image on a torso piece such as Minifigs.me.

I wouldn't be surprised if this minifig was made using the same service as I cannot identify the graphic. I suspect this minifig could have been ordered as a promotional item.
The actual parts themselves are so common that they might even be the cheapest parts you could get to make a minifig. The parts can be sourced easily for under a dollar assuming you bought the torso without a custom print.