Funny enough, clubs actually do now. GC stuffed it up for everyone. First round draft picks (especially those top 10s) are getting 400-500k now for their first extension. there was an article about it on afl.com.au a while ago.
Because of what GC got conned into doing to keep their kids, the whole league changed as players and player agents got wind of it.
I remember the article. I think it is unfair to blame all of that change on Gold Coast.
Western Bulldogs paid a million dollars a year for a first year player. That was probably the start of it.