What I find most bizarre about this is that for almost everything else on the list, the campaign explains its reasoning (e.g. 

Based on my credit I’m trying to close my first deal using conventional financing, VA Loan or 203K etc…I recently started my first DM campaign of Absentee owner and people with no mortgages or significant equity in their homes.This is my first campaign ever so I don’t know what to expect.

That being said just like chasing off market sellers require consistent marketing campaigns, going after MLS properties requires making a lot of low offers consistently...

Especially for marketing campaigns

It's always just the last 4 digits of the phone number they booked with for me, then my email campaigns don't have to change.  

It's hard to stand out.There are some owner-occupied segments with people who share motivating factors for selling their home.Seniors with Long-time Ownership: often ready to downsize or transition to assistance.Homeowners with Low Financial Stability Scores (FSS): Struggling financially and likely ready to cash in on their asset.Good luck with your campaign.

However, I am looking to scale up so I am curious to hear from all of you on what your best successes have been in terms of cost of acquisition, rates of return, etc. between acquiring properties from wholesalers vs. running your own yellow letter or similar marketing campaign.

I ran a direct mail campaign using a personal letter I had created that I had sent to most small multi-family property owners in the surrounding towns.

You can always start a mailing campaign and reach the sellers yourself.

I had plans to make a big marketing campaign, but I'm going to wait, button things up and play defense until we get a better idea of the true severity of the situation.