Its not that your wages are artificially increased, its that an H1B worker's wages are artificially decreased because they are trapped in the job and are unable

Its not that your wages are artificially increased, its that an H1B worker's wages are artificially decreased because they are trapped in the job and are unable to negotiate at market rate. They can't leave their job, so they can't negotiate a fair salary. The green-card costs the company $5k, but gives them a worker who can't leave for years.