If using a 3DS flashcard, there is a risk of being banned due to sharing a header with online play. This problem does not exist if using 3DS CFW and installing .cia files because they do not use the the same header files concept. Needing a unique header is a only required when using carts, not digital downloads (.cia files).
The bootrom exploit on the 3DS allows for very early control of the 3DS system. This allows you to create a full sysnand backup very early on so there is zero -0- risk of bricking. Combined with the added benefit of worry-less online play, there is literally no reason to use a sky3ds card. All 3DS flashcarts are just plain obsolete technology.
That is a reason why you were able to purchase it at such an inexpensive price. There is reduced demand for them due to the boot9strap exploit. I recommend selling it and installing boot9strap+ Luma CFW.