I think you are right. At the SCR-Even with the guard in the lot I slept better knowing the trailer was a hard target when I put the big stick device on my trailer wheel. The cheaper trailer devices can actually damage your trailer and are far easier to defeat.
For example I checked out the Trailer Keeper first. It is cheaper than the Big Stick, but in the end it is more time consuming to set up each time and it will cause damage to your trailer equipment, as will most other wheel locks on the market. It is a pain in the butt too. With Trailer Keeper -A lug nut has to be removed every time it is set up or taken down to prevent the wheel from going out of balance if their "lug latch" is left on by accident in transit, and if you forget to remove it Trailer Keeper can come in contact with the trailer fender and tear it up when you try to move it.
In addition Trailer Keeper is attached to only one lug pin.
Big stick is attached to all 5 and has an armored housing to protect the lugs. The Big Stick will ride outside of the fender rim if you forget to remove it (I already did BTW..

) and is much stronger because it attaches to all 5 lug pins. Finally the big stick mounting hub can be left on at all times without effecting wheel balance because it is symetrical.
IMO... You get what you pay for.