I mine ETC and ETH, both are profitable for me. My breakdown is such

6GPU
178MH/s
.80 ETC Daily
$2.64 - electrical cost
Daily Net - $9.32 (Based on $14.95 /ETC)
$279.60 - Monthly
I do not need to calculate for ROI due to the fact that yes the equipment loses value over time or I can eventually resell to get a few dollars back. But in the end its like a car, and I have had good use out of it. Even if I break even within a year, this is still good value. Ultimately the coins left over will have some sort of value. Also if you truly want to know your breakeven just calculate the cost per coin, which in my case equates to $3.30 / ETC. My aim is to pay the electrical cost monthly or every two months and the rest can sit in my wallet and as long as its not $3.30 range, I am profiting. We also need to look at way crypto currency was developed from the beginning. It's really a hedge against the fiat currency and insurance against an economic collapse. Banking institutions and countries are now doing away with physical cash and going digital. This is very different from crypto-currency in that you have no control if a bank decides to shut its doors or go out of business. With Crypto, it's your wallet.. your control your way. Unless you stupidly store it on exchanges.. JMHO..