When I joined the campaign (the others had been playing it for about 10 years at this point), I did ask about it, apparently there are strings attached. The item is wanted by a very powerful demon "who will, one day, come to get it".
That was nearly 15 years ago (play about 2-4 times per year), and nothing has happened. (And to be honest, I suspect never will.
The player exploits his x5ppm, and is effectively permanently flying and invisible, so there's pretty much zero chance of him ever being in the slightest danger.
What I've come to realise is that the group are all powergamers, focused on levelling up, getting new items and not much else (there's very little roleplaying in a session), so I'm pretty much stuck with it.
Look, this isn't my purview, but it sounds like your issues are more than just a x5 Multiplier.
You really don't have to play in "this" game if you aren't getting what you need. Ask the GM if you are playing a Player Character, as important to telling the story as everyone else, or an NPC? Let the GM know what you need to enjoy this RPG.
This might not be the group for you. It feels like there are no other groups in your area, but I'll bet there are. If not, you can start one. GM if you want. Someone else is doing it so you could too.
This is a RMSS/FRP game, right? Walking, Flying, etc, require %Activity.
In my game, everyone has a Base Movement Rate. This is modified by Pace. Are you Running, Sprinting, Dashing..? All movement requires %Act. Flying (per spell) is no different and actually more restrictive. My players know that if they move
100% of their allotted Move -based on the rate of their Fly spell, then that is their 100%Act for the round. No casting (10%Act for Instants and 75%Act for normal spells), no Observation or attacking, unless you want to sacrifice some of your %Act of one for the other.. ( Also, Invisibility is treated (for us) as a "soap bubble" effect. Any "violent" action has a good chance of popping the bubble. You know damn well that I'm going to ask for a Moving Maneuver if a caster is trucking along at 300 ft/rnd; yeah, that's only 20 mph, but it's wind resistance that will pop your Invis. bubble just as easily as falling off a ladder while Invis; "a violent action". Make your MM and there is no problem.)
My players bypass this by
*buying Ranks in the Acrobatics skill (SoHK pg 20) which provides a bonus to flying and levitation (not flappy flying with wings, that's under the Flying/Gliding skill), *using a Shield Spell to cut down on wind resistance (my Thomas the Tank Engine knowledge shows that streamlining can save fuel and increase speed by about 20%. This could give about a +20 bonus on a maneuver to "cut through air turbulence". Shield provides +25 DB so I'll give a +25 MM not to break Invis if they fly with a shield spell up.
*Casting Haste- which gives 200%Act; now you can Fly, cast and do other stuff..
But all of this is academic and really only for my game.. If you only play 2-4 times/year and you have fun, then keep playing. If you think you can run a better game, then it sounds like there's some time to try.
2-4 times/year leaves plenty of time for a new campaign..
You could start by always bringing up that pesky demon.. (Remind the GM)
"Great scott! Don't you know that not only is this a powerful Essence user before you, but he is also wanted by Netherbeings for his stolen golden demonic treasures the very knowledge of which would chill your soul, push you to the brink of insanity and curdle all of the fresh milk within 5 leagues?!! He asked for another beer! I say, we give him another beer!" Yeah, man. Ham it up at the local tavern. Be his 'demonic advocate' if you will.
But if the old hats that have been playing for 15 years don't have to make rolls to Fly while Invis and still perform X, Y and Z while the populace are comforted by their mere magical presence, then you don't either. Make that somersault while stepping out of the shower, while on horseback. If anyone asks why you shower with a horse, tell them your horsed is afraid of water, or to mind their own effing business.