Steemit's economy is fundamentally different from YouTube's, which relies on ad revenue (and perhaps user donation, like Patreon).

Steemit's reward money is produced by the coin's inflation. Every day there is a fixed allotment, or else the coin would have trouble holding value.

If everyone's content paid out indefinitely, the reward pool would be stretched thinner and thinner over time. 

Steemit's economy is not well suited for certain types of compensation, like you mentioned. You're best earning from both YT and Steemit, as there are no downsides from doing so.