Whats been the most successful format of earning NPs for you?
i'm talking about in-game, not JSP related

Restocking and shop/auction sniping. I can easily make 1-2 million a day doing either.

this

do you guys have any helpful tips? or know of a good online guide.
...i've tried auction sniping before but failed lol and i'm not too sure what the best things to look for are when restocking

Try looking around the Jellyneo site.

Games ? :D

Stock market.
As an inactive neopets player, just login neopets and buy stocks and sell at 60+.
Takes less than 2 minutes.

i dont even know what auction sniping is, i usually do stock market and sell at 100%, which is low, but its a quicker profit (but considerably smaller)..i restock when i have the patience, hope to get lucky with wheels/dailies.

Auction sniping is when you watch auction that are ending within 30 seconds or less. You look for big ticket items at low prices and jump in and get them at the last minute. You can get cheap PB's and mp's this way alot.

how do you know when auctions end in 30 seconds or less?