Honestly, I'm client-centric so I don't prefer a lowered standard of service despite I care highly about a SPs wellness when I get to know them better and still a 'day off' is best for all. We're not in the industrial revolution. It is true - this is not an industry with EI, 5 days of paid sick leave as per the ESA, and an employment package with three weeks of paid vacation. That's the reality of the transaction and we know this as a client. If you consider the 'human' aspect of the transaction above quality of service, then that's the synonym of "reality" for this 'hobby' and that's against self-interest and the integrity of the business model.
When I recently went to work sick and was in a bad mood from it, I made another coworker get the flu and my task output was terrible, while trying to avoid speaking with clients. Wasn't good for business or client relationships or the perception of my organization. It's true, I get paid sick day off and took two, returning to work rejuvenated. Better for everyone.