Reduced gold cost for first 4 rebirths
First 4 RB should have reduced gold cost, example could be RB1 = 200k, RB2 = 400k, RB3 = 600k, and RB4 = 800k .
The argument would be that new players struggle to find gold and do not fully understand trading, and established players would have no trouble finding gold to RB an alt char so it would not advantage seasoned players more than new people.