When possible just charge a $30 or more premium on their rent to cover damages/cleaning.

During the walkthrough on the first property we really just walked through with the tenant and I took notes on any damaged items they noticed.  

What happens when they claim you are not performing and want 3x damages because you have refused them access to the home that is legally theirs?

With regard to the mold, you are not responsible for damage prior to your ownership. 

First, most contingency fee cases are personal injury cases that pay out high dollar amounts in damages, thus it is profitable. 

Tenant agrees to allow Landlord timely access to premises to do maintenance and repair.Tenant will notify Landlord in a timely manner of any damages or problems as they arise, including damages caused by Tenant, malfunction of appliances or fixtures, and water/moisture leaks and spots.Tenant will take care of the premises, keeping them clean and clear of debris.

On the other hand, students can cause massive damage to your property and roommate drama is common.

No cashflow upsides to you because of section 8, just looks like more of a hassle and more people in the unit with increasing risk of damages at no benefit to you at all.

What happens when moving the fridge upstairs if damage is done to the property prior to closing??

This topic inspires me to set up an efficient process for following up after someone steals from me... whether is stolen items or unpaid rent/utilities or damages to my property.