I'm still a die-hard RH fan... I've considered GH on some bags, but partly for this reason: it seems to me that often Balenciaga will use better leather on the GH bags. I may be nuts thinking this - or maybe the glitz of GH just makes everything look a tad better - but it seems that the leather quality, or saturation of color, is different. Plomb leather, for example, was fluffy and pillowy on a lot of GSH bags; same with Tomato. On RH bags, Plomb was gorgeous as well but more even, smoother, less fluffy. S/S 07 Aquamarine color had a distinctly different shade to it with GGH. Another PFer pointed this out back in the day and I thought she was nuts, until someone posted photos of a side-by-side comparison. So, IMO, one way for Bal to push GH is to use better leather on GH bags.
The other thing that occurred to me is now that there are so many more bags produced (now sold in many more places than a few years back, and each style being available in 3 different hardware options), the number of each particular style produced (RH coin purses, for example) is smaller. Maybe this is Balenciaga's way of making each particular piece more sought-after and collectible like it was back in the day, now that it's so mass-produced.