I believe you are correct. If you notice when these crapcoins first launch, all the new members shout "Good Coin" and "This should be good" before the dev has even launched the source code. All they care about is mining and dumping. In order for these scams to work, they depend on the uninformed public to believe them that the coin is good.

All you hear is "to da moon" and "don't sell cheap" and "this coin will do this trust me". Out right scams. All while they are just waiting for an exchange to pick up the coin so they can dump and move on. If we succeed in educating people about the scams and allowing good projects to really shine, these scams will go the way of the dodo bird.

no exchanges will pick them up, no miners will mine, no one will do google docs exchanges. The scammers and mine/dump folk will only trade amongst themselves and slowly even they will stop.