What's up with the proprietary wines sold on some of these sites?

MaceKates thought this was worth mentioning said
1

I’ve seen a few wines sold that are branded for the actual site itself. Some of these being wines that are intentionally branded after the site (woot and meh wines) and some that are branded by a 3rd party but only exclusively sold on the deal-a-site. What is the deal with these wines for someone who knows nothing about them? Are they relabeled? Actual blends the company makes? Or discount wine that is bought and branded? What is the common quality of the wines? Are they hit or miss as far as what you get? Is this like costo branded stuff where you just need to figure out who the original distributor is?

Can anyone help with the understanding of these wines. Up until now I have been passing on them. Wondering if that is a mistake or they truly are just gag gift branded wines.