Asking for the true value of ...

Asking for the true value of the condensate tells us that the one asking the question has little to no understanding of a boiler system, or water treatment.

These are only a few of the cost savings realized by haveing return condensate:

The heat of the condensate water has already been paid for.  Return the condensate so you don't have to pay for it again in added fuel costs. 

The returned condensate is distilled water: using condensate for makeup allows us to raise the cycles of concentration, and thus lower the percent of boiler blowdown.  Again, less fue cost. 

More cycles of concentration, and less blowdown, means lower chemical costs for the boiler water treatment.

Returned condensate lowers the impurityes in the makeup water because it is blended  with the feed water to give us the boiler makeup water.  The quality of the mekeup water is better with a lower M alkalinity resulting is less carbonates and bicarbonates: thus when heated there is less carbon dioxide generated in the boiler to mix with the condensate and make carbonic acid.  The result is less steam corrosion and the need for less steam line corrosion prevention by chemicals: again less cost.