Consider the following factors:
1. Number of ASICs - the more you have them the better cumulative hashpower
2. Electricity costs - less is better.
3. Maintenance costs - less is better.
4. Cooling costs - less is better.

Now as a solo miner, you need to have a hashpower to be able to counter the combined hashpower of the all the miners in the world to be able to generate enough coins to either ROI and break-even or profit beyond break even point.

You can do the math yourself, I am not an expert in mining, but after 2013, mining on your own or even on a pool will cost you more than you can make.