LOL - Dude, it's not the manufacturer, it's the product(s). Here's your problem - there are a **lot** of people in the UL space who have embraced MYOG. Therefore, by definition, you're just not going to have the kind of market for re-sale that one might normally expect.
Here are some key points:
1. Out of the big three MYOG projects (tarp, quilt & pack), tarps are the easiest. For $60-70, even a beginner can construct a nice, functional tarp out of silnylon 1sts built to their *specific size & requirements*.
2. The bug bivy is a sort of special purpose, luxury item. Again, if you're dealing with experienced UL people, they are either going to (a) sew on around $10 of netting to the perimeter of the tarp; (b) take a headnet; (c) take a (real) bivy; or (d) go sans netting (my option - just takes lots of DEET).
You are no different from millions of other consumers who have walked into a retail situation, bought @ full price, and then discovered that (true) re-sale value is around 50% of retail. (Heck, REI's entire business model is based on this premise.)
Instead of criticizing a first-rate builder like MLD, perhaps you should first look to yourself. Here's an idea - keep the gear. It will last for years.