what's that mean
Bank transfer is several days faster than ACH so you can use the money right away. Bitcoin transfer is instantanious and they get to hold on to bitcoin while the rate goes up so they make money while the buyer loses money - and "eventually" they ship the product - who knows how profitable it will be by the time they ship it.
That's my newbie take on this. It's just there are so many people like us (maybe I should speak for myself) who want to buy into it that the vendors can do whatever they want.