Sorry. Noob in this. So supposely I buy this device does it comes loaded with all the amiibo ? Or Should I say if I got 0 amiibo is this device still useful ?
Inside each real Nintendo amiibo is an NFC tag. Think of it as a small capacity storage device. On the amiibo, Nintendo has written some data identifying the particular amiibo. iirc Nintendo also sells a few amiibo char cards (basically like poker card with NFC tag inside) without you having to buy the figure.
To *ahem* this, you can buy your own NFC tags (which can be read and written using a phone with NFC function and app) and write *ahem* amiibo data to them. These are very cheap (like us$10 for 100 pieces). Since you cannot visually read the data with naked eyes, you will have to label each tag yourself.
The next way is to buy NFC cards in the shape of poker cards that ppl have already created with amiibo data and printed nicely with picture, so you can easily identify which card is for which amiibo.
The above ways mean you will have many tags/cards around. What the n2elite does is it lets you *ahem* multiple amiibos on a single n2 (up to 200, they constantly update their app to add new amiibos). You switch which amiibo you want by pressing a physical button on the n2elite. This is convenient cos you only need one n2 elite. The disadvantage is that you cannot tell which amiibo is currently selected using your naked eyes.