While I agree this might not be the most professional thing ever, I don't think this is worth all this drama, jeez.
I mean, come on, if you stumble upon heralds or yeti, just do it. If you see people advertising for it on chat, just go for it. After a few days of farming, I don't think afk-ing or idling on spawn spot is that important. I mean, instead of doing something else (and checking for boss from time to time).
You're killing your own fun and get frustrated. If nothing pop up, then do something else.