WE SHOULD BE ENTITLED TO SAME DISCOUNTS AS MEMBERS OF R2R WHICH IS THE LARGEST REEF COMMUNITY IN THE WORLD.
That is a dicey.

Shipping rates are based on the amount companies ship. I agree that shipping has gone sky high. There have been several offers posted from companies that ship, here on R2R for members to take advantage of.
One con of this thought, would be that some would use a discount code for their personal or business use outside of shipping items sold on the classified here on R2R. It only takes a few to spoil it for all.
If one is shipping regularly they can negotiate a rate through the shippers, but they would also have to be a commercial entity to take advantage of shipping rates, thus commercial here on R2R. That would mean that they would have to become a sponsor.
As far as buying commercial Vs private here on R2R. This risks to bringing in something more than what one bought is that same as commercial. I have not had to opportunity to buy for a hobbyist, but I will say that I have several instances of apistasia and asterrina starfish that were introduced in to my system, purchasing from commercial.
As far as DOA, I would guess that private seller cannot take advantage of shipping insurance unless the insurance price is passed on to the buyer, thus making the cost of shipping even higher.
In conclusion, I would buy private when I find the right piece, such as a Walt Disney for the right price. If the piece arrived DOA, that is the risk that one takes for a lower priced prized piece.
This is my opinion and not R2R's