Many people asked about rotations on my interviews and if they did it in a non-grilling/accusatory way (saw a couple of those honestly and I cringed a bit) it didn't seem to adversely affect anyone. The majority of students we interacted with were 2nd years though, so short of where the rotations were and how many students went, they had limited info, as they had not gone on rotations yet.
As for this thread, I agree that many of the "hidden costs" are either well-known (e.g. taking Steps in addition to COMLEX), are school-specific (e.g. requiring you to pay for a specific board prep, expensive/non-existent rotation housing, etc.), are things that are present at a lot of medical schools in general (e.g. VSAS costs), or are individual specific (e.g. retaking PE, which costs the same at CS and has a similar failure rate - CS fail rate is like 5-6% now... after MDs complained that it was a pointless exam with a 98%+ pass rate).
DO schools are generally more expensive (not all of them), and I think more DO school students and MD state school students don't have the type of saving/family support that most other MD students have, which makes it even more painful. There definitely are added costs, and its one of the many reasons why we still recommend going US MD if you can. That said, comparing it to your next option (i.e. Carib MD) for becoming a doctor, DO is still a much cheaper/easier path.
OP, your situation sucks, and I'm sorry you have to go through all this. Just realize this is all just a bump. Regardless, you are still closer to finishing and all of this will be a distant memory when you are in residency. Focus on doing what you need to do for the PE, and don't look back.