The premium conversions seems a bit unfair for non usa users. E.g. 15$ for usa and 15 euros for others. I think it would not really matter but on the site it says $15 , then on the payment page it gets converted to euros. Could maybe alienate the user a bit.

IMO better to stick to a set price

Also does that mean selling a 120 15 euro account will yield 7.5 euros for the affiliate , or 7.5$

apart from that i look forward to working with you :-)