Here in Australia, the government puts a higher tax on UV inks and varnishes. This is because they regard them as being more environmentally unfriendly at the waste stage. UV inks do not break down in the environment like normal inks do, and therfore are a residual environmental hazard - Don't ask me if it balances out the use of less solvents.

Be careful of UV Gloss on dark or deep continuous tones like black or deep red. They easily show finger smudges. I learned the hard way.