It has been said time and time again that the best way to become a NeoMillionaire is through restock and then selling at your shop. True! But not completely. One can only buy a limited quantity of items through restocks. After your shop is size 30, you probably are having a difficult time with fully restocking your shop if you put your items on the shelves right after restocks.
So what do I do? I make my shop sell similar items. I prefer selling plushies. There are many collectors out there and don’t really mind buying plushies which are a little bit overpriced. Just don’t overdo it of course.
Now complete the different plushie sets. Buy from the Toy Shop or From the Shop Wizard, search red, blue, green, or yellow of each plushie type. Better yet, find a plushie spoiler list like the one found in my guild. Buy at least 1 of every type.
Keep track of how much you spend on everything. Just take a mental note of it if you buy then stock after each set.
Put everything into your shop and price them up by around 100 NP higher than the lowest in the shop wizard. If you find anything extremely low priced, buy it and then check again.
Now to make people come into your shop and see your goods, you would have to get to the top of the shop wizard often. For this, keep a few of your items priced 1 NP lower than the lowest in the shop wizard.
From here, all you need to to is to wait. Just remember to check you shop for the completeness of your sets and try to get them completed ASAP when the price drops lower than what you have sold it for.
I have had my shop sweeped by Neopians far too many times this way. I usually carry more than 60 different kinds of plushies and never let that number go down to 40 unless I am asleep or offline. You shop should be one of the things you check as often as possible. If you go online every 2 hours just to buy a scratchcard or spin the wheel of excitement, then do remember to check your shop as well.
My theory why this method works is that richer plushie collectors and shop owners with bigger shops prefer to buy their items from the least number of shops possible to save time and to complete their collection quickly. And few extra NP for the convenience is not too much for them to pay.
I hope this method works for you as well! – zephyr2k