Because it shows you have no skill or whatsoever.

Everyone can copy a picture from google and sell it.

And it also looks kind of poor when it is put on the model.

True. Copy-pasting is bad. It looks way better without shaders, in fact.

I can agree with Mapleleaf on some points, but it is after all your first texture set. Way too expensive, though.

If this set really sucks , i lowered the prices

I fail