Safe? The coins go peer-to-peer, directly from the buyer to the seller wallets. The seller can use any wallet they prefer and we never come into contact with the coins, unlike the vast majority of services out there such as Coinpayments or Bitpay. I don't understand what could be safer?
We don't charge any yearly percentage. It's a flat-fee for unlimited transactions per year.
Why would you prefer a % per transaction and numerous TXs?
Your offer is not friendly with small website business. Only website with $10k can have 0.59% fee. There is much more correct payment per transaction.
I am sure that you will get more feedback and new customers with small rate per tx.