I played IL-18D in current HaF game. Worked very well until 1979. Then the year was 1980, and fuel nearly killed me. Even with subsidies, playing soviet steel will always be dangerous.
The fuel subsidy makes sense, the subsidy on price, not so much. I remember paying 600k$ for IL14s when similar western planes were around 3/4M$. But that was not the incentive to play them. The incentive to play them was that they were available now - while there was a 4 years wait for their western counterparts. The more plane-restricted a game is, the more seductive soviet steel is. For a temporary use, that is.