Dan,
Good luck with the marketing - find financial backing and mass produce to keep your costs as low as possible so you have a margin to work with and lessen the likelihood of entry into the market (smaller volume producers will have higher relative costs); that is where you are apt to make some money. Trying to patent, adding in a couple lawyers and everyone involved tends to lose, except the lawyers.
We tried several types of conduits 1975 to 1991, including 1 1/2" black plastic irrigation line, a childrens corrugated plastic 'horn' with the bell cut off, an oversized hula-hoop, and even Flexible EMT similar to what you used, but the quality was not there and they didn't last. Friends at a shop called the Leather Tree even made us up a couple sleeves from thick leather. When the commercial leather ones became available we lost interest in experimenting.
We also were using wrist rockets with lead fishing weights and hunting bows and spinning reels to send lines into trees, and our best idea was to train squirrels to run up and through a good crotch and back down with the throw line tied to a little harness, but the training time and cost in peanuts were projected to be exorbitant. Now with the advent of super-well-controlled quadcopters you could probably fly a line up to set your TIP.
Now I use a Sidewinder-like device and do not think it was a wise decision for the patent office to allow a patent for the Big Shot as it is essentially a "slingshot", with a lot of prior art, as I think is the legal term.
Best of luck to all you're creating.