Cavalary: If you're talking of regional pricing, for quite a few years now we've been getting the increased Eurozone price too...
But depends on what games you're looking at buying. For normally looking at games that are 5+, and often 10+, years old and having no interest in AAA ones, and just on good sales, it should be a good enough limit. And remember the time when it used to be enough for just about anything on GOG, when the max price was $9.99 and twice a year nearly everything was half off?
I got here in 2013 so I don't really remember the max price of 10 dollars, but I remember that games where cheaper without the regional pricing and some sales where amazing. Still I can accept to pay a little more than that. The problem for me is the DRM... I don't pay anything for DRM, if I pay for DRM it's only if I know I can remove it and there is no alternative (like for ebook manga, they all got drm, but I can remove it with a calibre plugin and backup so I don't really care).