I have a hard time believing the blanket statements that "it's not possible to make money" mining. I realize it's difficult, time consuming, expensive, etc, but there are still miners out there doing the work. Some operations are getting paid, right? Is just getting increasingly consolidated into fewer and fewer large operations?
I would agree there are many factors. If you have low electricity and can mine year around you have a chance. It also depends on price you bought miner. Every person truly is very different on factors. I still believe ROI can be done, just it is not a set 90 day as it once was. Also factors such as having PSU's and not buying come into play.
I personally have two seasons winter mining and summer mining. Winter I had around 12k watts of gear. Heat was no issue at all. With summer coming I had to get rid of my S3's + 1T dragon and am currently working on my summer setup.