As already mentioned, I dont think all women with implants got them to appeal to men. But even if they did, you can't deny that a lot of guys like them (even if you may think they are the "wrong" kind of men).
I know there are guys out there who like smaller boobs or implants are a dealbreaker for them, but I think if you google "assymetrical boobs" you'll see cases where you'd really believe the girl is better off with some cosmetic enhancement.
I work in a strip club so I probably know more girls with implants than the average person. Most of the time, the implant will "settle" after a few years and sag enough to pass for a natural breast. And depending on the material, they can also feel very natural. I agree that badly done breast implants (ie wierd shape or too far apart) are unattractive. But often you can't tell. On the flip side, I have natural C-cup breasts and customers sometimes ask me if they are implants.
Now, I'm sure some believe that getting implants is just unnatural and shallow no matter what they look and feel like. Personally I dont think it's worth the health risks, especially if the woman is planning on breastfeeding later. But hey, it's not your body. A lot of body enhancements are more socially accepted... hair dyeing, piercings, tanning, contact lenses, tattoos... even getting braces. Wearing a push-up bra.
Why do men feel particularly deceived by breast implants?