Earlier quoted context omitted.
If you even have a few thousand people regularly watching you (whcih is common these days). The bandwidth costs start to add up.
Not really. Good dedicated servers come with multiple TB free = 1000x 1 GB stream. And usually it's only pennies afterwards.
So you go for a reseller which there are many stellar ones but they'll either utilize a program with the datacenter akin to an reseller affiliate program with them being the 3rd party support or do it all themselves. If they do the reseller affiliate program they cant really offer anything outside of theie markups on the existing offerings by the datacenter. If they do it all themselves then it becomes much more expensive for the upfront costs.
What you want is a VPS and a CDN which provides a better experience and what every streaming platform uses. Not that expensive either!