VET's price is based on supply and demand. If there are more people willing to buy than sell, its price will increase.
That said, it’s still a volatile digital asset, whose value is tied strongly to that of Bitcoin and the wider crypto market, and it’s prone to drastic fluctuations over time.
There are a number of other rival coins looking to occupy the same space, and appeal to dApp developers. The success of VeChain, and the price of the associated token, will be influenced in the long run by how those rivals fare.