Every professionally working entrepreneur always weighs up the costs and benefits.
This is not different when it comes to translators / interpreters. We calculate our costs and set the prices accordingly.
To state fixed prices here would not be fair to either of the two parties, since it may mean that the client pays too much or the translator / interpreter does not earn enough.
This is why it is part of the customer service of Inter-lation to write an individual and non-binding offer for every client.