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All the DTC that you have earned since the @dtube testnet started about 2 months ago will all be wiped clean when the main net goes live, they were never considered "real tokens," they were a test token to make sure the Avalon blockchain would work in testing phase. It actually even says this about the tokens (in a pop up) when you put your mouse over your token wallet count on Dtube.

Not to worry though because @dtube will be doing an airdrop to all of it's current users and it will be based upon the amount of activity you performed on the Dtube DApp since it's date of inception (about 2 years ago). So if you have been active on Dtube you might end up with a good chunk of real DTC airdropped into you account ;)

yes, it's no secret.