I do think some of the answers here are : Yes but , I do think when we talk about income we have to keep two things in mind :

1. Income should be stable
2. Income should be consistent

Therefore when we are talking about betting of any kind , especially the Sports betting.

1. You can not be sure if you are going to win the bet since the chance is always 50-50 or even less depending upon how the bet .
2. It's inconsistent
3.what will you do if another pandemic strikes and shuts down the industry for a while ?

Therefore I do think the answer is : NO.