There are a lot ways to dupe D2 items. The two biggest factors are this:
1) Does anyone really feel like spending a shitload of time writing a duping script that they'll be able to use 2 days before it's widespread and then bnet patches it?
2) Does anyone really mind taking a risk of actually running a script that does something other than take advantage of lag, more like a Diablo script where you're actually doing something pretty illegal.
I know of a few methods I could use to dupe, but if someone really wants to blatantly risk being caught like people do on regular Diablo servers, you're guna get caught. Recently they've been devoting a lot of attention to Diablo2 and Diablo2ex judging by the patch beta (if you haven't seen check it out on their site) and by the number of IP bans on the rise. I might be interested in writing such a script for a fee, but I can almost guarantee you will be caught or it will be neutralized within a few days if you abuse it. My advice would be just stick to the lag tricks if you really wana do effective duping, and maybe crack open a few of the earlier duping scripts and learn how they work. If you write your own scripts or understand them thoroughly, it'll most likely lead to more effective duping.