GP care is already paid for in the NHS. So by making use of GP services, you do not make further costs to NHS care.
If you attend hospital, this is charged to central government by the hospital services. It is best if this money is channelled to people who need it to prevent possible disability or death – we all want the help when we really need it. There is going to be less money to go round, so we all need to make sure we make use of hospital services when they will really count for us.