My brother was hounding me a couple of months ago for trading away our base set Charizard about 20 years ago. I thought it was a great deal getting 10 other holographics for it, which allowed us to collect all 150 pokemon cards eventually (we still had a dark charizard). Turns out it is worth an average of just over $90 now (http://pokemonprices.com/card_price/Charizard).