Both are bad habits.), define "working hours" (IE don't MMS me a picture of your unflushable toilet at 3 am). 

It really becomes a fun game and then a habit and then the cycle is unstoppable.

You will need to gather assumptions or facts on property management fees (10% typical average), vacancy rate, down payment or skin in the game (typically 20% for conventional bank mortgages or 25% hard money lenders), purchase costs ( could be more or less than asking price), rehab costs/expenses( estimated costs of repairs in your area on common repairs/ fix up costs to make Rental habitability, security, safety within or above state and local landlord/ tenant laws/codes).

However; I don't see what the harm would be, unless some type of preference was given. 

Also, if you're like me, I have several credit cards, so I use the one the furthest away from the total credit available to make purchases for my deals or my personal life-- I used to always use the same card thinking it was a good habit to consolidate and for tax reporting, but it can hurt your credit.Hard inquiries vs. soft inquiries.  

But there's no harm being in a good to very good investment.  

````````````````````````````From the  Dept of RE in Calif.Landlord’s responsibility for repairsBefore renting a rental unit to a tenant, a landlord must make the unit fit to live in, or habitable.

Advising people how to do illegal activities that harm the personal or property rights of others is outrageous.

Good article to read.http://bit.ly/2fqHT2f

You are correct that if it is left undisturbed there is no harmful effect,  where the issues occur is when removing them or if the are broken and the dust gets into the air.