There are some ways to earn money without paicing bets and I would like to talk about some of them.
First and the main one is the affiliate/referal programas, this way by sharing your affiliate link you will get some incom from the users bets, isn't easy to get good affiliate (users who bet a lot) but with one high roller you could make a descent amount.
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I see but I don't still think it's necessary to get an income from gambling based on any affiliate program or the other, you might be thinking the bonuses from the referral worth it but they are just peanuts and it's high time people think out of this entirely cause it's heading no where. It's better of to own ones business and start accumulating money instead of this because it ain't profitable like you think. Tho your opinion of gambling as income without betting it's actually nice but then the outcome is small and with time I don't think it'll generate something huge so this is why it's better of to gamble for fun instead of making it as a source of livelihood.
Moreover, I don't think if those affiliate program is still even working up till now. Actually you're right when you Said that the best way is just to own a business and start accumulating money instead of wasting our time in running those affiliate program that can't even pay a decent amount. However, I think anyone who has a business will never think of engaging him/ her self in running those affiliate program. Is obvious that those who are into this affiliate program are the ones who are left with no choice, so they just choose to accept the little offer instead of staying idle.