Unintuitive Server Boosting Payment Restriction

This was kind of a weird situation, but figured I'd lay it out to see if you guys are interested in fixing this, as I was about to give up on buying an additional boost, so this problem could be costing you money. I'll be honest, I lose my credit cards more frequently then most people. So, the one I had on my account when I bought Nitro was expired when I went to buy one more boost to get a server up to level 2. It autoselects the credit card you have on your account when buying the boost and doesn't give you an option to change it. This prompted me to go to my billing options and I add a new card and set it as my default, but that still doesn't let me use it when buying a boost, it still wants to use the one that I bought Nitro with. It took me a bit before I thought of going to the Nitro tab and saw that there's a place where you select which card it will charge you for that and changed it accordingly. Just seems kinda unintuitive to have two separate places that someone has to make sure the proper card is selected to buy a boost. You can buy server boosts without Nitro, doesn't make much sense that the card you use for Nitro has to be the same one used for additional boosts.