Yes you can "guarantee results." The firm charges a fee, if they do not achieve the "guaranteed results." they refund a portion of or the full fee.

Or you pay the firm for performance. Many good firms charge about $1,500 per month. I prefer to charge for performance.

Some search terms are very hard like Jewelery, I have a friend in the business and told him the risk reward was too high for him to invest in his website.

Other terms are much easier like "pizza shop Youngstown"

It is important to work with a firm that wants to work with you. They must be motivated to get you results.

Many of the best SEO people are consultants. It is both an art and a science and the good ones are far and few between.

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The most successful/best SEO company is the major search engines, themselves. They even offer SEO tutorials which really work. Unfortunately, when you examine the metatags of any number of so-called "experts," you will find any number of spamdexed, loaded entries which artificially elevate their websites and subject them to possible reporting to spamreport@google.com, for example, which will have their websites summarily removed from Google’s database.

Rather than hire an SEO company, why not read a Google tutorial which is presented below. The tips really work!

You may want to consider some simple algorithms which,
when observed and committed in designing of a website
with placement of various critical metatags that can
surely achieve a high search engine presence and
increase Internet traffic to your website. These
metatag strategies work well with published webpages
at Google and Yahoo.

Placement of Metatags:

A ranking or search order does take place with Google
and Yahoo and it begins with the "Title" metag which
should consist of no more than 65 characters separated
by commas. The "Title" should describe in generic
terms, the goods and services, followed by a location
from which the resource is located, i.e., city, state.
The placement of a domain name which is not generic
within the "Title" is not appropriate, unless your
domain name is a major recognizable brand name.

The second metatag is the "Description" which is
usually 25-30 words to form a complete sentence which
best describes one’s goods and services.

And the very last category – "Keywords" are also
somewhat limited to 15-16 words which can be plural
and compound in nature. Again, avoid multiple entries
which could be mistaken as "spamdexed entries" which
is defined as the loading, and submission of
repetitive words into a particular metatag category.
"Spamdexing" when discovered on a webpage and reported
to Google’s spamreport.com can result in the
elimination of your website from their search
directory.

Here’s an example of a very highly-placed website on
Google.com: Begin with the very "generic" search query
"sandwiches downtown los angeles," taking note to not
abbreviate Los Angeles to "LA" and of course, leave
out the parentheses ("). It will bring up some 427,000 search results. Check out where "Nazos.net" is ranked. It’s ranked #1! Again, Nazos.net’s high web presence was achieved by proper web design and placement of relevant metatags
according to Google’s publication guidelines.

Good luck!