Sure, max export value 500 m dollars - if the buyer never used the aircraft purchased. To use them in an air force you need spares, weapons, training of mechanics/engineers, ground handling equipment, possibly simulator(s)... and more. That is where a lot of the profit lies in a deal.
Wait 10 years? There are replacement cycles for types in service. If your fighters are reaching max hours, you can't wait 10 years to replace them. You will have bought something else by the time Tejas Mk1A is available. If it is available at all. Might be out of production by 2031.