Not at current market value. You'd make about 4 bucks a day mining dogecoins. Even if bitcoin went back up to $1000 you'd make about 7 bucks a day mining 24/7. Difficulty is just too high ATM, even for alternative currencies.
Take it from someone who has been doing it awhile, I have 3 rigs running(5 7970s, 4 5770s, a 5670 and a 7750) right now for about 4.2 MH/s and I make almost nothing after expenses. With the value of LTC dropping daily it is only getting worse too.
The only reason I am still running is because it is still cold where I live and LTC mining heats my house (yes dead serious, 100% of my heat this winter has been LTC mining, toasty 72F inside while single digits outside). As soon as it warms up a bit I am shutting down, just not worth it anymore unless I am saving on my heating bills.
What do you mean by expenses? How expensive is your electricity? I just got a rig and haven't gotten a power bill yet, but at 700w and .06 cents per kwh, my power bill should only be 20$ more, right? Am I missing something?