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There weren't any individual cards worth anything, unless I wanted to pay to have them graded, but the collector at the flea market was enthused by my father's organization (everything was in binders, in order)
Essentially, if everyone plays it cool, the group benefits, but if one person betrays the rest, only the betrayer benefits and everyone else suffers the consequences
When your commander would go to your hand or library, you may send it to the command zone instead, and it never enters those zones
Also, know that each link monster will require certain conditions from the cards you use to summon it
If you do, all those creatures form a single creature