What you say is probably true for mass-appeal pop music. It's not true for highly trained classical musicians. I appreciate that the figure of 10,000 hours was my number (picked because it sounded big - clearly I should have thought a bit harder), but you must see that the amount of work that you describe is just a world away from the work that goes into top-level music (which generally amounts to playing all day, every day for years). My point isn't that they therefore deserve to be remunerated; it's simply not possible for people to spend enough time to get really good if they aren't remunerated for it, because you can't practice enough and work a separate job.
Similarly, when it comes to highly skilled musicians, helping the organisation means helping the musicians. The organisations are almost always charities (I've just looked up Britain's permanent orchestras, and of the five orchestras that Wikipedia lists as the most prestigious all five are charities). A large amount of their money goes on their musicians (I've looked up one at random (since charities' accounts are available online) - the London Philharmonic - which spends 60% of its income on paying its musicians. Almost all the rest goes on paying for a venue). And they aren't comfortably off - in 4 out of the past 5 years, deducting their profit from CD distribution would leave them well into the red. CD sales may represent a small part of an orchestra's turnover (for the LPO just a little over 10%), but the low cost of it means that it has a disproportionate impact on financial viability.