Nah, If you have a 20% faster miner than everybody else, you build a BIG farm and ROI a 750ti-980ti card every day 
And then you wait for the competition to wake up...
I think it would be good money to make a etherum miner for the 750ti. Such a coin. Such a profit.
You have $200k for such a endeavor? Something to consider is you're actually crowd funding your 'investment' in a farm when you distribute it to everyone. You're essentially taking a piece of everyones farm, which is impossible to build on your own and you don't have ROI costs. Nor do you lose money when your enhancements go to waste, for instance, 20% faster L2V2 still isn't making more then Quark right now.And then you wait for the competition to wake up...
I think it would be good money to make a etherum miner for the 750ti. Such a coin. Such a profit.
Not worth the risk.
I have a few rigs, and I keep buying some more slowly. With the low BTC price and high energy costs it's not worth it. But If I break even I still have alot of nice hardware to play with.
In order to make a living of making mining software you need to be able to optimize every algo 10-20% and do it before anybody else. Wolf0 is the only one I know who can do that.