Hey, dude, I hunt G5 mats, too. And I know that there are G5's that are currently unavailable due to a lack of system states.
I also know that in short time those system states will be available again and I'll be able to go find the HGEs that I'm looking for.
In the meantime, there are plenty of other HGEs with farmable mats that can be traded for the ones people need.
That's true. In fact I've heard a rumour that there's an exploit that allows you to farm a persistent HGE by relogging until it expires. Though it's not well known, so it's not a lot of help. And while the USSs that do exist are relatively abundant and productive, they're not so abundant and productive that trading off their contents at 6:1 is an attractive prospect.
Still, if the BGS does return to the status quo ante, all this will soon be behind us. The trouble is that I'm also hearing rumours that the BGS changes are going to lead to HGE USS types being tied to faction state rather than system state. If that's true, the current rules and tools for finding them are going to be useless, and even after the BGS stabilises there will be difficulties for many until new rules and tools emerge. Which I daresay they eventually will, but in the meantime some of us are going to be left feeling like the Peters who have been robbed to pay Paul.