For bloggers, social sharing of your posts is almost always a good thing. A social share of your site brings in visitors who see the link, improves the Google juice of your website, and can expose your website to new audiences who might not visit it otherwise.
All of which are to the good. But for the blogger who is trying to generate enough revenue from their website to cover expenses (whatever those might be), high volumes of traffic and social engagement are only half the battle. You also need revenue in the form of ad clicks.