Fees are NOT collected or otherwise linked to the crypto wallets. They are determined by the current blockchain situation and the miners! BC Vault has nothing to do with the amount of fees!
Fees are always paid on the sender's side! You might see a high fee in the transaction list when you send your crypto from an exchange. This is normal and paid by the exchange itself (remember what is said above - sender pays fees!) as they use one transaction for many small transactions to their users. The actual fee you paid was presented to you on the exchange side - check there for details.
Cryptocurrencies use fees (transaction fees or miner fees) to pay miners for confirming the transactions that are requested on the blockchain. The amount of fee varies from currency to currency. BC Vault application will suggest you a fee that should put your transaction through in 1-2 blocks, but you can always manually adjust the fee should you wish so:
The higher fee you pay, the faster your transaction will be confirmed by the miners. If you use too low fee, on the other hand, your transaction might not be processed at all and discarded.
So if we take an example with Bitcoin (BTC) that has a block time of 10min the recommended fee should generally provide you with a transaction confirmation from anywhere between 5-20min.
You might catch the next block very quickly from your transaction or in the worst case in 10 minutes (as you have to wait for at least the next block).
In Ethereum (ETH) for example, block times are much faster 10-19s.
When networks become extremely busy it might happen that you will have to wait hours or even days for transaction confirmation! This is all happening on the blockchain itself and once you get "Transaction successful" confirmation from the BC Vault, this is it from the crypto wallet side.
For current information on Ethereum (ETH) fees check the following website: ethgasstation.info
For current information on Bitcoin (BTC) fees check the following website: btc.com/stats/fee
Check this article for more detailed information about fees: Miner fees