Does it make sense to pay for a professional title search on this?

All parties were aware of that, meaning they knew I was the buyer and buyer agent who would be paid for my services as the agent.

Yes, C property at best, but I still expect some attempt at professionalism. 

I’m a 32 year old IT systems professional.

I am not a legal professional and this is not legal advice just personal opinion.

Cap rates come from closed sales that are analyzed by an independent professional third party.Crap rates are fictitious numbers made up by clueless individuals trying to scam newbie investors.There is no reason for you to be trying to calculate either.

My advice, make sure the roles are clearly spelled out in an agreement that is signed by all parties involved.  

and how it looks if you or they want to move out before the other (with you as owner, you cannot discriminate when you place new neighbors for them).Still use a rental agreement, and give both parties an easy out if it isn't working out.  

It also seems like the professionals are getting more clients.

An email with your name and website says you're professional.