I'm pretty convinced there are a lot of sellers on these third party marketplaces that arrive with a truckload of Widget A - once Widget A sells out, they're go

I'm pretty convinced there are a lot of sellers on these third party marketplaces that arrive with a truckload of Widget A - once Widget A sells out, they're gone... on to the next thing or rebranded and selling Widget C. Especially when you're selling a low-margin plastic commodity item. If you don't get support while they're still actively selling YOUR widget, good luck.