[mrtron]

It is called variable pricing - and the service you provide shouldn't change based on what keywords are relevant. It is not like BMW vs Kia whatsoever.

I don't claim to know all about SEO, but the basics are incredibly simple. I do know there is an abundance of people offering services like this, and they like to spread a lot of FUDD.

[redorb]

some keywords are harder than others (based on competition) and pretty much based on their value, so yeah you have to charge more