If you do not have very cheap electricity, it is better not to start mining now.
Yes, it is getting hard to make ends meet currently. If you already have the rigs there is still some profit to eek out, but if you are just starting out I would advise to try and start with 1 or two GPUs and utilize your existing computer if possible rather than buying a dedicated rig. This way you can work out the numbers yourself as the various online calculators are usually overly optimistic with their profitability predicitions.
I would suggest opposite of this. More GPU's you start with it will be better. You will utilize your resources better (slots on motherboard, PSU ... ) instead of having just one or two cards. You will hit ROI faster with more GPUs.