In the grand scheme of things, $5 is not a lot of money - but it's also relative to one's current financial situation, and there is no obligation to donate.
If someone wants to donate, they'll donate if they have the means. If they don't have the means to donate, or they don't want to donate, they'll still count as a viewer which boosts the algorithm. Shame them for not donating, they're less likely to donate when they do have the means. Simple math.
Anything beyond that is far more multifaceted and unique in nearly every situation, but for Pippa, I don't think she has to worry about losing her audience any time soon as long as she keeps streaming, no matter how hard VTweeters try. Pink rabbit good.