The materials drop rate matches the odds of pulling heroes at f2p quite closely. So if you got more 5* then you’d have to up the materials drop rate. And then the whole game dynamic changes.
F2p compete on their wits and hard work. I have been playing for a year and have 7 maxxed 5* and over 20 maxxed 4*.
You also have to take into account tc20, epic tokens and Atlantis summons.
Check out this thread for some inspiring f2p rosters;
