You literally cut out the bit that made your entire post unnecessary.
Ok, let's try again...
Being a cleaner is fine. The comparison is the cleaner turns up at start time and starts work. A cleaner began being a cleaner the day they got a cleaning job. They didn't spend years getting up to speed cleaning-wise in order to get the job. And when they've finished cleaning, they don't have to practice cleaning in the evenings in order to bring something new to the clean every time they work. This is why the pay is relatively low; and why I think a band member is worth more, given that both bandie and cleaner are competent in their jobs.
No, the cleaner doesn't go home and practice cleaning (although the majority do probably go home and clean up after their family). Yes, you need to practice the guitar/bass/didgeridoo in order to be a competent player. However, I would say that 90% of people that work as a musician enjoy and like the instrument they are playing, I would guess that with cleaning personell it goes the other way, 90% prefer not to have to put their hands anywhere near the mess that the evening crowd made.
Again, let's go back to the part I underlined, considering both are competent at their job...
A band member may be a great musician, be excellent at his instrument, but that does not mean that they are of more value to a venue than the cleaning staff. Bands get employed because the owner wants to, cleaning staff get employed because they are 100% necessary in order to keep the establishment open (unless the owner wants to do it himself).
I am not disagreeing with the fact that you make about musicians being underpayed at a live venue (in many cases), the fact that I am disagreeing with you is that you seem to think that as an artist you deserve more than another person, just because you are an artist.
My way of seeing it is that staff at a venue (be it cleaning, bar tending, security, etc.) are paid what they are paid due to the "going rate" or "established rate" for the job they do, they choose to either accept the pay or find a different job.
Musicians on the other hand are paid what the person buying decides they are worth, and you are just as free as the rest of the staff to either accept what is being offered or move on and find a venue that will pay what you are asking. Some venues pay more, others less. The ones who pay more have a bigger selection of artists to choose from and more "named" brands, the ones who pay less have a selection of lesser known, cheaper alternatives.
And just for the record, I am not disagreeing with what you posted initially, I totally agree that live music should be better paid (so should the cleaners BTW), however, you seem to just want to argue with everyone who doesn't agree with your point of view.
A business is a monetary based system, you make money or you lose your business. Every business makes a decision as to how they want to go about the money making part. Some prefer small margins and higher turnover, others prefer elite clientele with much higher margins. Your band is your business and you are free to sell it at whatever price you want, but absolutely noone is obliged to pay what you request.