We did a quick back of the envelope calculations. Unless we were getting free electricity, it isn't even worth it to use S9s to mine anymore.
Even if you had free power, it probably isn't worth it to install Antminer S9's because the buildout will be expensive. Even if you could get the miners for $120 each, the cooling + electric circuits will easily cost $200+ for each one (depends on labor cost). So each S9 actually costs $320. The Bitmain T15 or S15 would be better.
After some consideration we decided to announce availability of miner hosting at our facility again.