That's a very good point.
When Monsieur Simard referred to buying a house or acquiring a house, there are lots of comparisons, usually, on the same street and in the same city, but assets such as a pipeline are pretty unique. There are a few pipelines around, but they don't serve the same producers and they don't get to the same markets. That's why it's inherently difficult to assess the value of a pipeline.
One method is to look at the value of the future flows of revenue, given that the tolls are regulated. It's one method to assess how much the government could sell that asset for, but a buyer could decide to buy it for economic interests that went beyond the future flows, such as, for example, energy security purposes if it were a foreign entity or other factors if it believed that government policy would change in the future.
In one way or the other, they could be willing to pay more or even less, and then there is the aspect of the number of buyers. A bidding war is possible, but it's very difficult to know exactly until there's a “for sale” sign.