If you really need the lower salary worker then sure, you can have them, but it will cost you.
I would also make the company sponsoring the H1-B visa responsible for all relocation costs when they fire someone on the visa.
The fee should scale with the cost of training a US resident to do the job. If the fee is too low than toss the application cause the applicant should just pay for somebody's training instead.
If you really need the lower salary worker then sure, you can have them, but it will cost you.
I would also make the company sponsoring the H1-B visa responsible for all relocation costs when they fire someone on the visa.