You need to look at the political drivers and local resource cases that drive investment decisions on a local, case-by-case basis. There is no one single price for any type of power generation, they all vary depending on location. For instance natural gas prices fluctuate dramatically, Boston and New York City routinely pay much higher prices for gas than the Henry Hub price that is generally used in energy statistics.
Saskatchewan is a perfect example of why a regional government would make the decision to invest in CCS. Saskatchewan has coal and it has mature oil fields, but they don't have natural gas in the province, nor good solar resources, they do have good wind though. For the regional govt it makes complete sense to invest in CCS and CO2-EOR because it supports two major industries in their province with significant employment and tax revenues, while helping to mitigate carbon emissions.
For Saskatchewan to invest in wind, and they do have wind farms, they must import natural gas from outside the province to match up with the wind. In this scenario the natural gas is fired in simple cycle turbines which are less efficient than combined cycle turbines (that are suited for baseload), and hence have higher CO2 emissions than combined cycle. In this scenario, CO2 emisssions are lower by doing 90% carbon capture on coal, than doing wind + simple cycle gas, plus two important local industries continue to stay in business.
Other regional governments are starting to make the same argument. In England they see the opportunity to marry up their fading North Sea oil with their coal industry through CCS and CO2-EOR. The Western Governers Association in the USA also released a memo making the same case.
If your region has coal resources that you do not wish to see go out of business, and you have appropriate oil fields nearby, it is perfectly logical to invest in CCS and CO2-EOR. Of course other regions will make different decisons based on their local resource case. And none of these technologies are mutually exclusive options, you can have renewables and clean coal together.
Here in New York where I live we could be using our own domestic gas in state to help lower prices and put New Yorkers to work, but the environmental lobby would rather shut the drilling industry down and force the state to import gas from elsewhere.