I guess it depends a lot on your power cost. I pay 4.6 cents per kw, so 26,5$ per month in power for each L3+.
Not that hard to make more than 26,5$. Your power seems quite expensive!
Today I made 3.5$ by mining various coins (including XVG which I don't like but it was the most profitable a good chunck of the day).
Still profitable enough to run but I'll not get rich this way...
I agree it's highly probable that bitmain will release something new soon, this may be what's gona kill my L3+
