At those prices it doesn't make sense to dump it, cuz you won't get nothin for it.
They are much akin to Glocks; polymer framed 9mm firearms produced in abundant quantity that are reliable handguns in a pinch. Why they aren't held onto is the fact they are reliable but otherwise extremely unremarkable firearms. A Glock is a Glock is a Glock. No one collects Glocks. Tons of people rely on them for self-defense but I'll challenge anyone to cite someone bragging on their collection of tupperware guns.
I went to Gunbroker and type in my search term and then clicked "used". Here's what came up:
SD9VE - 22 matches
M&P 9mm - 212 matches
Glock 19 - 179 matches
SW9VE - 33 matches
Shield 9mm - 116 matches
Ruger LC9S - 42 matches
My point is that what is available for sale has little bearing on it's quality or reliability. In fact the more popular a gun is, the more often it shows up for sale used. The SD9VE is one of the top ten selling handguns in the US, along with the Shield 9mm and the Glock 19.
A functional pistol at a cheap price.
I never bought one due to the trigger feel.
A friend of my son purchased an SD40VE on Gun Broker for 160.00. He said he bid on this just for the fun of bidding and lo and behold, he won it. I was a little suspicious of the price be after talking to the friend, he confirmed it. He doesn't like the trigger but may install an aftermarket set up. So good for him, I'm waiting for the range report, which may be at my home range. All in all, a step up from the High Point .45 as his carry gun. And at a good price!
I have to admit my sigma sw40ve surprised the hell out of me the first time I fired it. It don't look like much for power but it packs a nice punch. Accuracy is excellent and i really didn't mind the tight trigger pull. I almost hesitated to buy it because it looks to be a lightweight pistol with not much to it. But like I said it surprised the hell out of me. It's a damn good gun and I'm glad I bought it...Its a combination of grass being greener on the other side and not commiting to a particular firearm design. Enough people say this gun or that gun is better so the owner comes to a conclusion that it will make themselves better....which it wont.
Bottom line is if your good with your Sigma then why would you want to change.
Personally I love the sigma/SD series. I think they are pretty much perfect. I am accurate with them and actually like heavier triggers. They handle like a streamlined glock and dont have the bulk. I also think the sigma series guns are really good looking polymer pistols compared to what has been coming out the last few years. They just had a nice smooth FN type look to them before the sd series.
The only new striker I have like in the last few years is the HK VP9. Nice pistol but it doesnt do anything my sigmas cant do.