Yup, making neopoints isn't much of a problem. Here's your alternatives.
If you have a fast connection, try:
Restocking from main shops: Lots of big and fast NP to be made here. Only problem is it takes a while to learn what items are "good" and what items are "bad" (Not all items are profitable, you can actually lose money if you don't know what to go after in which store). Learning the technique is also difficult, but definately gets easier with time.
Auction Sniping: Another way to fast riches, auction sniping demands a fast hand, and a fast connection. But the profits can be IMMENSE for a good sniper. Not as much know-how is needed for sniping in comparison to restocks, but like always, practice makes perfect.
If you don't have a fast connection:
Trades: This one is my personal favorite. You'd be suprised by the bargains out there in trades. Throw a ton of cheap junk items in your trades and bid cash on as many items as you would like. Be sure to know that value on what you are bidding on however, and make sure you give yourself plenty of room for profit (about a 20% ratio). BID ON A LOT OF ITEMS. Sure, about 80-90% of the people will reject you, but the 20-10% that accept makes it all worthwhile if you do it in volume.
Reselling/Wiz Hunting: Hunting on wiz can be quite profitable. Learn the prices of some good easy selling buyable items (cough, cough, codestones, map pieces, dubloons, faeries, etc..) and hunt the cheap ones down on wiz. Buy them, slap them in your shop for 1np under lowest retail and let the shop do the work and the profits roll in. This is the technique I use along with trades, and I'm not at all complaining about my income.
I promise you, it works.
Stocks: Not one I'd really reccommend. Sure, you can gain np, but usually only huge amounts of time (unless you day-trade) and the possibility of losing NP is a good one. The effort-to-np ratio is also a big loser here thanks to the cap-off on how many shares you can purchase per day. Truth is, you could be using the NP you would invest in a stock and invest it in reselling instead, and make a lot more profit in a shorter amount of time. Just my opinion though....I used to be an avid stock market hound until I learned what NP I could make in other methods.
Games: A fun diversion, but not something you can count on to make "HUGE NP". The effort to NP ratio is awful here. I can speak from experience, it is possible to make 100k in a day by playing games (and only skill games at that, no luck/chance) I put that theory to the test a few months ago for an article I wrote for the NT. It did get published, but the 100k mark took 16 hours of straight game playing.
Games are a great thing to do when you are wiz-banned or just bored.
They really can break up the monotony of the neo day, but shouldn't be relied on as your only np making source.
Anyhooo...hope that helps you.
Val