That is, would you buy a million-dollar property to make $100 even if that represented an infinite return on investment?

As Bruce said, you don't need a license to "represent" yourself, only to represent others in a transaction.

Signed by landlord or representative and the tenant. 

In the US, the blockchain represents a solution for a problem that does not exist.

For example, 4515 sinclair built in 1938 was remodeled very nicely and sold for 1.540 mil with multiple offers which represented a 100k increase from the list price.

I assume that's because he is no longer representing himself and has an agent. 

Depends who you're representing I guess! 

STRs typically represent a higher/risk reward.

Fast forward to yesterday(appraisals are done, waiting on underwriting) after a text from the realtor about signing a document that says I'm okay with him representing me and the seller, I called him and brought up the fact that I'd looked over the purchase agreement and the rental agreement and nothing was stated about the rent increase, but it was clearly stated that ALL rental income even prepaid rents (the warehouse was paid in full up front) would be prorated to the buyer (roughly 2200/month)I'm at a crossroads on what to do, part of me wants to just ask for earnest money and appraisal fees back and walk away, but the cashflow of $2300 (current rents not counting warehouse) on a $105,000 property just seems to appealing to walk away from, what do the more experienced investors than myself think

Does that $40k/yr still represent a good ROI at today's prices?