It's not that there is so many rig providers. Rigs are just not being rented cause mining becomes less and less profitable. Look on coinwarz, LTC almost on top

At the moment, mining LTC will get you about 0.0068 BTC/MH/Day, so renting is still better than that, but I'm not sure if it's better than multicoin mining. Mining Digibyte is about 0.0096 BTC/MH/Day, so it's a bit of a tight race. We need a new coin to get released so that folks jump on that and go for bigger projected profits, or our rigs will not get rented for much more than they are now.
Even places like clever mining can't keep up.. they are struggling the past 24 hours to match litecoin.. they are at 0.00657 .. which is less than litecoin.
I also think that many of these multicoin pools were not expecting Aurora Coin to drop so much.. and since it takes a long time for AUR to confirm, then their expected profits are dropping too.