juts a quick follow up...
within 15 minutes of me posting the message above that I had switched one of my machines to Mona - Mona's network Hash went from 94 MH/s to 119 MH/s - the highest it has ever been.
well sorry to report... I've switched again and left Mona for a higher paying coin if you're watching and I know you are...

this sounds like way too much work to make a $ 2-3 more an hour.
I like your other idea, point mutiple miners to 4 or so coins and sell high etc.
depending on how much hash you have an extra $3/hour is $36/day or $1,116 / month can be quite substantial. I see people making $1/day mining in the pools.
its not too much work for me to press a few keys to net an extra $1,116 / month.