Because you do.
and so do you.. and ill have you know quite alot of my artwork doesnt require me to use alot of filters mainly just blurs and blending modes with a bit of help from feather and bevel... the filters i use are...
Gaussian Blur
Colour flip/rotate
Displacement
Seamless texture maker (HARDLY)
Smudge
Anti-alias
Feather
Outline object (another rare one i use)
Glow
Clouds
Brushes
Relief
Alpha mask
Dents
now if you notice most of these hardly "create" anything they just edit or change what is already made in a slight way

I want to see you beat that rather than using a simple background colour and then get getting a single colour and using a polar inversion and a twist filter.... *claps* great work... im not dissing your work.. it does look good... im just saying itcan easily be done and then i do stuff like whats above and people instantly think i overuse filters... ffs i dont even use shape 3D.. also does the picture below look like i use a ton of effects when i didnt even use one besides feather.. that is actually my mate and his girlfriend
