changelly-- price for 1 BCH is $4150 USD avg. price is $2800!! BTC $21000 USD Market average $14000 50% fee premium IS YOUR SITE BROKEN??
coinmama- decent prices, hidden 5% additional credit card fee on top of their 5% makes it not realistic
localbitcoins- for amounts over $5000 with fiat in my country you are looking at a 9% fee premium
So you are starting to answer my question, it looks like at least 10% to get fiat to crypto or exchange.