I consider all the On-Stage Keyboard Dust Covers that I have, one for each keyboard synth, as part of investment in keeping the instruments trouble free from the absolute bane to our instruments; dust, dander, and yes, as gross as it sounds, all the skin cells all of which we humans are constantly shedding.
Consider how only say a $15. or $20. cover of the caliber aforementioned costs weighed against how much it would cost JUST for one optical encoder to be replaced on my Waldorf Q or two different older non-Ti Access Virus Keyboards, it pretty much answers itself.
Even non-optical encoders and pots attract dust, etc. within the electrical component grease/lubrication within pots, then there’s what dust will do to both push buttons and then there’s the actual contacts for the keys and if you have after touch on those keys, it makes it even more of a quintessential minor investment.
Just try to get in habit of whether buying instrument new or used, purchasing a proper cover for it at same time.
I have a very good quality HEPA filter air purifier in my place and even with that, and keeping things pretty neat and clean, you would be amazed how much dust and what have you ends-up easily blocked and you can see it working when you look under and on black surface of Virus under same area, there’s no dust, etc. at all.
Note: these stretchy covers made of black Lycra have an additional benefit in that they allow you to wrap around back/sides to prevent that same crap from getting into area have yet to even mention, the electrical boards/components.
Also, it takes no time at all to use an attachment on your vacuum and suck all that trapped stuff that’s on top of your cover, even the stuff that’s very hard for the eye to see. It’s also very quick removing and replacing covers.
Would you even consider placing a $2000+ instrument on a wobbly second or third tier keyboard stand? Or, another analogy; would you place sub par crappy tires even on a used Lamborghini?
Lastly, if you live where you have central air in your townhouse or apartment as I do, it’s equally important to change that air cleaner element in the basement for your apartment with a high quality one on a regular basis for obvious reasons. This goes for just a regular furnace blower element.
I just counted, and just in all keyboard synths in my set-ups, 9 in all; that’s 9 x $20. = $180. , which you would easily pay for shipping/insurance to and from a reputable repair place for an out of warranty instrument with keys and we have not even considered that technician’s hourly rate and cost for proper part(s). Not to mention lost time from beloved instrument.
Consider always using “Keyboard Kondoms”, as I sardonically like to call them!!
Also, always getting the correct size for application is paramount because they are made to be incredibly fine woven in that if you are trying to save $5. by stretching the heck out of a 25 or 49 key cover to make it fit on your 61 key cover, it’s only making that fine mesh open-up by doing so and being a pound or two foolish and definitely not a penny wise in grand schema of things.
If money is really an issue and you are living on noodles in order to have those awesome instruments, at least for now place a heavier beach towel over when not in-use and retiring for evening.