The service is 3%. For the payment withdraw we do not pay the bitcoin network fee, so we change a fee 2% fee at the end since we don't know what the bitcoin network fee will be on any given day.
For inexpensive items, when the bitcoin fee is high, we make no money and often lose money on transactions. For example a $100 item the total fee is $5. If the bitcoin network fee is more than $5, we lose money.
You can see from this chart bitcoin network fees were very high from January to June. That's 6 months. During this time we lost money or broke even on every transaction under $600-700. When it really spiked in May we lost money on every transaction under $1000.
https://bitinfocharts.com/comparison/bitcoin-transactionfees.html#1y
The fees are lower now, but still around $5. When the fee is low, we change our withdraw fee from 2% to 1%. We have not changed it to 1% yet because we're trying to make up for that last 6 months. If the fee stays low, we'll make the change in 1-2 months.