Here are some tips in winning auctions on neopets.
1 Know what your buying! (If it's a paintbrush for 4k its probably a plushie)
2 Know what your paying! (Make sure you pay what you want)
3 Know the value! (Do not buy anything unless you know you can resell it for more)
4 Be quick! ( You might put in a cheap bid and lose it because you don't pay attention)
5 Don't collect junk! (Just because it's cheap doesn't mean you should buy it)
With these tips you will be successful with Neopet auctions!