You just have to disclose you are selling your "equitable interest" in a property. 

For instance they will need to disclose their fees up front as an example.

Was that not disclosed up front?

Voice your budget concerns, disclose you have posted the ad.

They disclosed that there was a blockage in the drain and hired a plumber who used a water jet to clear what they claimed were flushable wipes causing the issue.

Both state that they are subject to the underlying lien and both disclose its existence. 

No lien investor discloses what they have in levy before it is published in the Daily Report and the Sheriff will not tell you what they are levying on before the ads run either. 

I had to pay to get it done, and I'm not sure if companies can disclose such information. 

If the agent/listing disclosed it needs work, selling as-is but that you likely wouldn’t win bid with an inspection contingency, then you decided not to have it inspected, that’s a different, hard lesson.

If the OP didn't get a survey prior to closing, I suspect there may be an exception to coverage for any matter which would be disclosed by an accurate survey.