ViaBTC have no economic incentive to accelerate your transaction so all they have is an agenda to increase their popularity among people who are too stingy to set a normal fee for their transaction.
If you're using any normal wallet, you can choose your fee, and it should be set to the
current recommended fee or higher. In its current state, Bitcoin is not for quick confirmations.
I don't know why people do always believe on that ViaBtc accelerator I do think they can affect to fasten up the confirmation of a certain transaction.I have tried it once but still confirmation took so long but well I strongly believe because of the build up of unconfirmed transactions on the network if you try to see it as of my writing its almost 180k.