I understand what you mean, but no i am not a plugin builder yet. I am still learning the software as i convert some of my sites to oxwall. I do have some software that i have written such as an affiliate software, poll software, and php licensing software but they are not built as plugins although they are quite easy to install as a bridge off the oxwall. But i have not had the time to work on any plugin adapters for them yet. One day i will do some plugins but that will be awhile..
You do know there is no magic potion for SEO right? If there was everyone would do it. The truth is that there are only a few people that know how search engine rankings really work and those are the owners of the major search engines, and software engineers that work for the company, and they are bound to silence. Even many of those engineers only know one small part of it, it is intentional by design and to protect the integrity of it all. If noone knows the secret then there is no insider BS ya know.
I would never rely on hocus pocus web sites that promise top listings, most of them are full of horse hockey. All most of them do is apply the same principles that you can on your own for free. The SEO business is another business in my opinion that has exploited peoples lack of knowledge and lazyness to make tons of money, and its not the SEO sites fault, its the consumers fault.
Anyone can split hairs on this topic, there are a zillion variances if you want to go that way. But the bare bones is still the same, a popular site gets traffic from word of mouth, advertising, and most importantly content. Content is the main factor of any successful site. Example look at craigs list, is it fancy NO, does it have tons of flash eye candy NO. It has content that people want, and that is the key.
So forget all the hocus pocus websites that promise pipe dreams for cash. Just stay diligent and use that money to advertise, buy features that people will like. And develope CONTENT!
Ok i am off my podiem now lol.... :) enjoy your day