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I disagree. They aren't a waste of money and they most definitely aren't useless since they provide the much needed initial exposure to the site regardless of the fact that they may or may not provide special offers.
They could always run them for a short period to observe whether they are helping or not.
This is primarily why so many gambling sites launch their own signature campaigns in this forum. I observed that they are usually way more helpful when compared to various bounties(Social media etc).
It is your right to disagree, but kindly understand why I said something is useless.
I gave at least one condition why a campaign can be something useless and wasting money.
There were some sites in this forum, had signature campaign but they were failed to gain interest, even few of them closed the site down after the the campaign.
The main idea is that when you are going to spend some money to advertise your product, you should realize about how good is your product, should realize the whole industry, if it is not competitive enough then you are absolutely going to waste your money for nothing.