I would never buy a cel that I do not want to 
possess forever. When I buy a cel, I have 
absolutely no intentions of going through the
trouble of selling it. However, if I buy a cel 
for $100 and see something similar later selling 
at ebay for $50, it would be hard not to feel 
cheated. So, even if I have never sold a cel, the 
answer to your question is, no.
When the market goes crazy like that, it is more 
fun to stand in the sidelines and watch.