SI weapons are now resellers paradise. They try to buy them at 50-60 and sell for 90-100. No way to list them on AH, no AH history - perfect for reselling.
These guns are not that good anyway. Good only with ZX amp and you can use it with TT pistol too, or maybe chon + a101. Overkill doesn't matter anymore after 2.0 so you can hunt punies with tt guns. SI guns made sense in pre-2.0 since they saved some overkill when you hunted 10hp mobs.