I understand the HST rebate to generally be just a small fraction of the overall HST charged, is that correct?

Quick dump all your property to me at a fraction of what to pay to get out while you can!

However, that's only a fraction of the opportunities available for purchase. 

If, as you say, they are funding deals in other LLCs they own, that is equivalent to making a loan to themselves, which is a prohibited transaction... even if they only own a fractional interest in the entity.  

The only charges/costs that are permissible 1031 Exchange expenses are the selling/closing costs, which generally include the following: real estate broker's commission, title insurance costs (unless lender related), escrow fees, closing attorney fees, recording costs, Qualified Intermediary fees, etc.4) If the investor completing the 1031 Exchange is going to acquire a fractional interest in the replacement property, the acquisition must be structured so that the fractional interest satisfies his/her 1031 Exchange values (i.e. his/her percentage ownership equates to them having traded equal based on their net sale price and all of their equity is reinvested) and it must be considered an interest in real estate (i.e. as tenants-in-common and not a partnership interest).

Saw a commercial last night for one of these websites which promises to set up an entity for a fraction of the cost of a lawyer.  

Examples: fractional interest; life estate.4) Lien position fun.  

There is real, substantial value here at a fraction of the cost of a college education that may or may not lead to a job.

You'd be surprised the contractor items and trim you can get at a fraction of the price of the big box stores.

Other than girding the other party to sell, the TIC owner can sell their fractional interest or swap for some other consideration.Sound ugly?