The contacts of RAM will oxidize... you know.
A little bit of my own experience:
So my dad found a stick of RAM (if you're interested, DDR2) and I tried to add it to an old computer (... Pentium 4).
(Skipped what I've done, a short summary: BSoD and FAIL with memtest86+)
After that, I get a rubber and rub the metal contacts of that piece of RAM, then it worked normally.
The question is: Is it a good way to clean a piece of RAM by erasing it with an eraser?
(P.S. To be honest, I touch pieces of RAM with my bare hand with no electrostatic precautions.)
By the way, pun intended.