If you can go by actual credible reports, there is one by Brazil which tested both Gripen and Rafale
http://www.thehindu.com/opinion/op-ed/affordable-air-power/article5919437.ece
. The head of the Brazilian Air Force (FAB), Juniti Saito, has recently stated that they chose the Swedish Gripen NG after an exhaustive evaluation emphasised its performance, the degree of technology transfer and price. The FAB estimated that it would cost $4,000 per flying hour rather than about $14,000 for the heavier Rafale.
So it is a named source and one who is chief of Brazilian Air force
As per Janes , Rafale cost per hour is about US$ 16500
https://www.ftm.nl/upload/content/files/IHS Jane's Jet Operating Costs White Paper FINAL 13th March 2012(1).pdf
And I am sure it wont come to 10000 in few years,
Try to get your figures right. Rafale life cycle costs are not lower, actually the Rafale spares are more expensive than those of Su-30 MKI and that might end up making Rafale more expensive than Su-30 in life cycle costs
By the way 16000 is not close to 10000, saying "closer to 15000 might have been more accurate. Have credible source/link to provide for your point about "cost per hour of flying Rafale" ??