Because when you have 20 full rigs running like me and having AwesomeMiner switching pools, managing the miners, and now always showing the newest/most profitable coins, $170 is ~12 hours worth of mining.
Thanks for that reply. I think when I buy my 11th rig, that would justify the $170 purchase 
I was asking what use it had (the $170 purchase) for those with just 1 or 2 rigs; for people who manage just fine with the FREE or the $35 version of Awesome Miner?This is currently around 15-20 days of mining for us little guys