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I assume your services are limited to the locale, i.e. if someone in location A (which focuses on SEO) wants PPC, you'd refer them to location B.   With that in mind, all locations can be a lead-gen engine for all your services.  Why not put all services on each location page?

Perhaps I am not fully understanding the question, but I have a feeling you're looking at this from your perspective and overlooking the users perspective?

I think this is a design preference rather than an "SEO Benefit".  Parallax offers clean design for a site is more detailed than  landing page and less detailed than a full-on-website.  I think the user benefit comes in to play with clean design and a mobile friendly environment.  And when done well, they look super cool.

I'd go with hyphens for two main reasons.  I am sure there are more.

1. It's a common best practice.  Hyphens are used to to separate words in a keyword phrase (new-content).

2. It's a small win for usability because it is easier on the eye.  http://www.yourbrand.com/somecontentaboutaproduct is harder to read http://www.yourbrand.com/than some-content-about-a-product.  Think about it through the eyes of an interested party who finds the link from a social share.  Getting design right isn't just about color, white space and layout, but how the overall brand appears.

We're considering running a promotion to donate some cash to a charity for every new follower we gain during our user conference.  Could this be considered buying followers, which could put our account at risk for closure?

I'd go with hyphens for two main reasons.  I am sure there are more.

1. It's a common best practice.  Hyphens are used to to separate words in a keyword phrase (new-content).

2. It's a small win for usability because it is easier on the eye.  http://www.yourbrand.com/somecontentaboutaproduct is harder to read http://www.yourbrand.com/than some-content-about-a-product.  Think about it through the eyes of an interested party who finds the link from a social share.  Getting design right isn't just about color, white space and layout, but how the overall brand appears.

I think this is a design preference rather than an "SEO Benefit".  Parallax offers clean design for a site is more detailed than  landing page and less detailed than a full-on-website.  I think the user benefit comes in to play with clean design and a mobile friendly environment.  And when done well, they look super cool.