It'll be work to litigate later and you'll have no proof of intended harm.

The lender is going to know that the tenant's lease payment obligation will end when they buy the house, so the rent isn't going to hurt their debt-to-income ratio or otherwise harm their ability to get a mortgage.2.  

I will tell you that if you don't have an understanding of all of this, it may not be the best option for you, as it can cause you more harm than good.  

I see no harm in posting same.

No harm in reviewing again and again.

If I am cautious about the big ticket capex items(roof, heat/air), what is the harm in purchasing these types of property?  

This has led to harm to MANY sellers.

Over-leveraging can be just as harmful as under-leveraging.

No harm in ASKING your Lender, is there?

Pretty well accepted premis-a neighborhood of small houses will harm the value of larger homes and vice versa, so you're fine, imo all other things considered equal.