Actually mate , iranian economy owns pakistan's . lol
but the issue is not money , firstly iran is under UN sanctions we cannot buy anything .
secondly , iranian officials are pushing the national firms very very hard for self-sufficiency . for example even before the year 2007 when iran was not sanctioned militarily , we didnt buy any fighter jets at all . except some mig-29s from 1990s .
iran completely had the ability to buy heck lot of fighter jets from russia for example . even buying 250 Su-30s (with iranian upgrades ) was an option when iranian analysts rejected the offer .
We are pushing very hard to build our own industry and you'll be surprised by the outcome in 2-3 years
these things take time , specially in air force . but in Ground forces and Navy , where it takes less time , iran is already the most powerful nation in ME countries .