Oiling your chips doesn't give a shiney wet look. Some pictures may appear that way because the micropores of an oiled chip are now sealed and the flash catches these reflective qualities and causes it to shine in the image at a greater degree. In person, the difference is primarily in handling, as opposed to visible shine. Once properly air dried, it will be clean and protected chips you have, not plasticy shiney chips with an unhinged resale value. Used chips are used chips. They'll get the same appearance over the course of much use; except at least with properly oiling, their appearance will be uniform and protected--even once they fully dry out without use over time. I would suggest that this increases their resale value.
It simply gives them a clean feel and protects them from other forms of oils and contaminants. Next to a freshly unpacked chip, there will be a noticeable difference.
I also put some unused, uncleaned and unoiled factory dust-covered chips into play at a tournament I hosted the chips for, due to not having enough $100 blacks in circulation. I had 3 people question the strange appearance of said chips amongst the others. 1 guy said, what's with these diseased looking chips? One guy pulled his separate from the others at the table I was dealing (they were that noticeable), because they kept sticking while he was trying to shuffle them.
Afterwards, it was easy to find all $10,000 worth of the $100 black chips. You could noticebly see every form of debris, finger prints and a few with even some sticky food stuck to them--all having a splotchy appearance. Then I started finding factory dust on the felts of my poker tables.
The other chips show no signs of having been handled and foreign particles aren't sticking to them and they get nothing but compliments from the masses using them.
To those saying they will feel like plastic--nah. Their feel is the same regardless. A China clay feels like a China clay, and so on. Oiling the chip doesn't make it feel or look like plastic. It does, however, make it easier to handle, shuffle and keep a clean appearance and protect it from foreign debris.
The benefits of oiling chips, correctly, is certain--but giving the effort to do so isn't for everyone.