Wow. 20% is a huge part of the income in my opinion. I think you really love gambling if you are willing to spend that portion. And to be honest (maybe I’m from a poor country and don’t understand something 
) I cannot imagine the structure of expenses where gambling would take 20%. There should probably always be more important spending than this entertainment.
Less or more 20% on your monthly income wouldnt matter as long you do able to sustain yourself and since people does have different situation in terms of income and spending or lifestyle depending on where ) I cannot imagine the structure of expenses where gambling would take 20%. There should probably always be more important spending than this entertainment.you do lived.
20% is indeed a big portion into your monthly income which it should be less if you do really mind on prioritizing over things than with gambling.
Addiction is only happening when you are spending way more than in your limit.It wouldnt matter what percentage as long you do have the limit.
I see one reasonable option for spending such a large part of income on gambling - if a person has huge savings and current income does not have much influence on his life, then if he wants, he can even spend 100 percent on gambling. All other options look dubious to me, although I am not saying that this is an addiction, just a wrong decision (in my subjective opinion).