The first sentence has 2 mistakes. It should be:
"However much your services are worth to the company, that's how much the company will pay you."
The second sentence contains a reduced relative clause. Without the reduction it would be :
"His mother inherited a business which was worth 15,000 dollars a year."
"are" and "were" are the verbs which go with "worth", and this, in turn, is used as an adjective.