They'll say it's new hardware so you have to buy once more. And make ROI this time. And that old hardware was inefficient so you got lucky we even converted that shit. The thing is that sure, litecoin mining was unprofitable, but they tell they mine the most profitable coin...
Litecoin mining was indeed unprofitable. And so was all scrypt mining for any reasonable mix of coins (every multipool suffered from low payouts, because there were no scrypt coins in reasonable market depth that could be mined). And due to the low BTC price, scrypt mining became unprofitable at ~10 Watt per MH/s.
If new hardware would allow scrypt mining at, e.g., 1 Watt per MH/s this would lower the production cost by a factor of 10 and this new hardware would be profitable. If (and that is a big "if") such hardware would be available we would offer it.