I have to agree with SS on this one. If you get rid of the 'money cards', you are left with a whole lot of nothing!!! Trade away (or sell) the lesser cards that you can get rid of. Hold the 'money cards' b/c they will only get harder to find for the remaining collectors of his cards. Trust me, the longer a collector has to wait for RARE cards, the more they will pay. There really are still some Canseco collectors out there looking for YOUR goodies!!! Those 1/1's will command more money the longer they sit in your possession. There are still people that collect him. The fact that he is one of the steriod-era front-runners makes his cards more valuable. Look at how much Pete Rose cards still sell for!
In my own opinion, keep the rarer cards and only throw them out for very rare JG cards. Trade or sell the rest for whatever JG cards you can get.