If these houses have stable long-term tenants, I share your concern.

I'll share my thoughts on a few of your points:1.

Know where to draw the line so an unscrupulous investor doesn't abuse you and then share nothing in return. 

The key to success is understanding the nuances of the market—different neighborhoods perform very differently, and having a strong team on the ground is essential.If you’re interested, I’m happy to share some resources on investing in Detroit and what makes it work for BRRRR.

They've got these city-specific groups where investors from all over the place come together to share the best vendors, suppliers, and trustworthy contractors in the area.

The house was $200,000, negotiated down to $190,000 with a $10,000 EM.Our funding letter states cash deal, up to $300,000 to be considered cash deal, no appraisal necessary (if you want to see a copy, will be more than happy to share so you know I'm not lying.)Closing was for 15 days because it was a cash deal.

With that I can flex my offer to include profit sharing if needed.  

We asked for receipts but haven't received them, even though according to contract they're mandated to share them.  

If you don’t mind sharing, how much did you have to invest in your first property? 

Dominic, I've found that participating on BiggerPockets forums, appearing on podcasts, and speaking at conferences have built trust with first-time passive investors when those forum posts, podcast discussions, and conference presentations show my experience, track record, and market knowledge to those reading, listening, or attending.This doesn't mean "selling from the stage", but instead, sharing actionable, useful information that I've gleaned from my many years of experience and from my own research.