First, you should be running with an airfilter for your induction. The air filter should be positively secured to the induction such that it can't come loose or block the induction in any way. This prevents access to the induction for spraying "starting fluid."
Second, the most effective application of a starting fluid is during the starting process, not before. This puts you in a position of applying the material in the close presence of a moving propeller.
Third, most light airplane systems are updraft, unlike priming your car or tractor in which pouring fuel or spraying fluid down the induction puts the flammables downstream of the carb.
Fourth, so-called priming with the acceleration pump, or fogging the induction with "starting fluid" creates a fire hazard, particularly with a backfire by placing a volatile mixture near the front of the induction. Condensation of that mist, drips, runs, etc, can pool either in the induction or beneath it and create a fire which can be difficult to fight or put out.
Fifth, WD-40 isn't starting fluid, nor should it be used as such. Why not just pick up any number of flammable chemicals and spray it in your aircraft induction every time you want to start the engine? Why not just learn to use it properly when "starting fluid" isn't necessary.
Sixth, show me what engine manuacturer, or aircraft manufacturer recommends the use of "starting fluid" to do an engine start.
Learn to start the engine properly and it won't be an issue for you.