Tell me, what is riskier?
- Buying a highly fluctuating cryptocurrency and locking it up for ~13 weeks.
OR - Writing an article and publishing it.
Nobody is arguing that the simple action of pushing a button requires less work than writing an article. Obviously, people usually read an article as well, before upvoting it, but the curation rewards aren't really about the voting action; they're a representation of the staked Steem (STEEMPOWER) of the voter.
I'm pretty sure, you'd think differently if you'd have more stake in this system, and would power up your rewards, instead of sending them to exchanges.