Another factor is that international students typically have the financial means to be considering applying internationally due to additional costs such as airfare and being unable to bring many living essentials from home. As you stated, there are not many Iranian students at Hopkins (I never met any, and they haven’t reported any from what I’ve seen), which is definitely great for you since Hopkins (like most schools, honestly) value diversity and the perspective you bring. Hopkins loves to tout all the countries its incoming class represents, and you offer the chance to raise that marketing stat by one more! Of course that alone will not guarantee aid.
I believe it is still worthwhile to apply if you are interested in the school. Honestly, I’m sure you will face this dilemma at most schools unless you’re somehow able to get a guaranteed scholarship prior to applying (which of course, will not happen). You can also try and find schools with better stats regarding this matter, but remember that stats like these aren’t benchmarks the school aims for, but largely depend on the applicant pool year to year. International applicants I imagine vary significantly from year to year beyond the few major feeder countries (e.g. Canada, China, Korea, India).