Yeah thats is what he exactly mean, don't just keep your coins in your wallet of make an faucets you must spend it and enjoy it, because signature campaign and faucets are not forever,.
Signature campaign will be forever because they need to advertise things. If there are no product may be there will be no signature campaign but the new things is always coming and they need a lot of promotion to attract people join to their site so signature campaign will not be dead
Signature campaigns are useful for advertising and for generating new content for the forum. But they can still disappear. There are other ways to promote new businesses in the forum. And the forum is only one place where to promote things. And if a lot of new content created is spam the forum may ban paid signatures. There are always threads going on about it. And many older members complaining because of it.