I would keep it; prices on good die clashes are increasing. We must remember that the die clash is one of the few error coins that is not being returned to the Mint for recycling. Broad strikes, off-center strikes, double strikes (or any multiple strike coin) or any thing that makes the coin larger than it is supposed to be, will not fit through the coin wrapping machines. So, companies like Strings and Sons, Wells Fargo, Loomis, Brinks and others, who are getting their coins from the Mints, will return coins that are rejected from their wrapping machines to the Mints.
So, while there are still error coins to be found (even though quality control has increased at the Mints), a portion of the error types that were found in bags of coins are not being found in today's coins. However, die clashes are one of those error types that still make it out of the Mints and thus for the error collector, one of the few errors that can be had reasonably.
BJ Neff