They calculate commission on a ten dollar sale as this.
24 cents for 2.4% plus 30 cents.
The FVF is calculated separately thus the Ebay / paypal charge is a total of $ 1.53 which is 15.3 %
And if you pay $7.50 to post it the total charges are
S 7.50 postage, FVF's of $ 2.27
If you pay $5.00 wholesale for the item you will make a net profit of $2.72 less packaging costs.

So do not expect to take a holiday to the seaside as the profit does not even cover a bus fare to the city.

And pray you do not suffer false claims and chargebacks.