It makes sense logically that those with higher dht would be better responders. This is because dht levels don't dictate whether a person is bald or not. I believe that there is a dht threshold and if above this, a person starts to bald. So if a person is balding, they would need to lower their dht below this level. This means that this threshold can be anywhere below this person's current level. There are simply more numbers below a high number than there is a low number.
Also, since dht is lowered by a percentage by finasteride, a higher base level would be more of a drastic change in dht level.
It would be interesting to find out if side effects are more common if one goes below the minimum level of dht needed for sexual function or if even drastic changes cause side effects as well. By this I mean going from like 85ng/mL to like 30ng/mL. 30 is still above the minimum commonly cited level of acceptable dht but this is still a huge change in what this hypothetical person's dht once was. Would this huge drop cause side effects? Or are side effects more common in those with moderate dht levels since they would experience a huge drop and potentially below the minimum level? Or do those with low base dht experience more side effects because they were low to begin with?