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It's USA, UK, Canada and Australia. Also the conversion rate depends on many factors such as your landing page design, sales-copy words, online support etc..

Interested into try the service of 1k G+. PM me the detail to process it.

EDIT: Added you in my skype.

Good collection.

Here's another two useful tools
Jaaxy | The Worlds Most Advanced Keyword Tool
Keywords Suggestion Tool | 100% Free SEO Tools

Quality content means if the content really does worth of your readers time. If you want to measure the content quality then you've to proofread the content by yourself or the other option is to hire...

It's a technique to compress your site, so that it can load faster.
You can check it through this tool to confirm if the GZip compression is ON.

for manual spinning: The Best Spinner
for auto spinning: WordAi

Are you sure that it is not some kind of proxy bot traffic?

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The Best Spinner

Try using Interspire email marketer, you can find it via Google.

@OP: I'd suggest you to contribute in authority blogs that are related to your niche via writing quality comments that make sense to the readers if their blogs. Use your site link in website field...