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I have a client who's 7 domains and single website (instantpages) exists within the clutches of GoDaddy.

They own 6 kewyord rich domain names that 301 redirect with masking to the main branded domain.

In effect, what this provides is the ability to add a title tag and meta description for a keyword rich domain name that displays content through an iframe.

So really it's not duplicate content but this practice sets off my spidey sense that this is not a best practice regarding SEO.

I want to suggest for the client to drop the idea of masking and do a straight 301 redirect to main branded domain. I'm sure that is fine but these domains are Not similar variations but actually vary widely: massage-city.com, city-massage.com, city-acupuncture.com, acupuncture-city.com, city-chiropractic.com, chiropractic-city.com etc ---- Doesn't Google frown on redirecting 6 domains to a single domain if they vary widely?

Words of wisdom appreciated.

I have been guest blogging on various websites. The web pages that display my guest posts have zero page authority but a great domain authority of 60/100 or more. 2 links I developed are noted below as examples:

• http://www.evancarmichael.com/Small-Business-Consulting/8101/How-To-Hire-Extraordinary-Salespeople.html

• https://www.biggerpockets.com/blogs/4195/blog_posts/28772-4-essentials-for-rental-property-owners 

Am I wasting my time with this?
Thank you!

Numbers in a URL does not have a negative effect on rank. The clearer the URL the better but if you have your keyword in the URL (even with extra numbers) you are okay. Best practices say that dynamic URLs should be converted to SEO friendly urls, this can be done in the settings of your website content management system.