I think 10Gbps in general is the max. I haven't thought about that level of speed because it's expensive, for both the plan and the need to upgrade all my network equipment to support 10Gb.
I think different countries have different PPP, so I wouldn't say it's fair to compare directly like that. I think ease of access to such services and how much it costs in relation to wages is a better gauge.
We're early adopters. Early adopters have a higher tolerance for (and ability to deal with) things like bugs, confusing UI, uncertainty, and probably continual change for the short term.
Not to mention, a lack of content. While it's populating nicely it's still not like Reddit, especially for niche subjects. You definitely have to endure a lot of shouting in the wind situations while this builds up.