$40 of peercoin mined per day: possible? I have a friend who tells me she mines $40 worth of PPC per day per machine.  She has around 5  Cointerra ASIC servers working all day long.  One server is part of a pool.

I don't know enough about the rates.  But to me, it sounds very unlikely.  

Is this, in fact, possible?
It would take around 1.6 TH/s to mine that as BTC and then exchange it, or 2 TH/s to mine that much PPC (not counting minting the PPC that you're mining, which is supposed to work out to 1% per year).

Cointerra sells a 1.6 TH/s miner for $3,500. With this $17,500 investment (plus any computers, electricity, maintenance, time, etc. associated with that), yes, she is mining $200/day on average currently (but ever-decreasing as the difficulty goes up), subject to market volatility. If only one is part of a pool and the rest are solo mining, that means she's taking the chance that she might never get anything of value from those 4 servers. That is a pretty high stakes gamble, if you ask me.