Lawyers ask a fee for legal services. Guidance with a sale contract is a legal service. These pages are about the fee for this service.
In continental Europe it's obligatory to take a contract lawyer in case you want the make a contract about the sale of real estate.
For the transfer of other goods also an accountant could do the job.
Most sale contract are without a legal consultant.
You can find out more about this matter on the international law forum in the following countries: