The risk versus reward here is literally non-existent. Your grandchildren will sing songs about this play if you are patient.
Do not take financial advice from me though, I am retarded.
There is a Pokemon card that is a sleeper right now. Mega Gengar EX from Phantasmal Flames. The set is still in print for another year and a half. Right now at a card show, you can buy these for $2-$3. Gengar premium is alive and well.
I am betting that when this set goes out of print this will be a $30-$40 card. I am buying as many of these as possible right now and will buy every single one you have. Historically, no one has ever broken even in Pokemon by just holding onto your cards.