if you can do it on your own, then do it on your own.
there are a lot of unconfident people who are afraid they won't be able to get their cart to work (not knowing which software they need to use etc.)
think of clueless parents offering a flashcart to their child...
You only need the AK2i flashed if you're using it on a DSi or intend to use it on a DSi. On bog-standard DS Phat/Lite you don't need to worry as there's no flashcart blocking code in the firmware. It's not the MicroSD card that's flashed, it's the AK2i itself.
As I recall, if you choose the Premium Flashing Service without a MicroSD card it costs $1 and the flash the Acekard for DSi firmware 1.4.1
If you add a MicroSD card at the same time, the Premium Flashing Service costs $2. In this case in addition to flashing the Acekard they will set AKAIO up on the MicroSD card.
edit: Ok, so now it's $2 for the Premium Flashing Service regardless if you add a MicroSD card or not. If You want the Premium Flashing Service without a MicroSD card, just choose 'none' as the MicroSD card.