Do you really need THAT fast of a transaction though?
I searched on their page...and found exactly why this accelerator is being provided as a 'service':
that includes a minimum 0.0001BTC/KB fee to ViaBTC
They're just looking for money. Save yourself the hassle and conduct your tx's naturally

That just means the transaction must include a minimum fee of 0.0001 btc/kb. This is just to prevent transactions with too low fees being added. What they offer is a certain amount of transactions included per a block they mine to make it easier for some transactions to confirm if there's some problems.
(I've personally used it and I've gotten my TX confirmed once ViaBTC finds a block)
It's really convenient imo.