Does it turn religious worship into a cheap, commercially-run affair?
No. In order to have a megachurch, you have to accept marketing as evangelism and commerce as religion
first. Only then can you have a megachurch.
Joel Osteen, whom I find rather likable, makes no bones about running his church as a family business. At least he's honest about it. Franklin Graham notes that "Just being the son of Billy Graham won't get me into heaven." It will, however, get him to be President of the Billy Graham Evangelistic Association, which sponsored his father's "Crusades" and sponsors Franklin's "Festivals" and Franklin's son Will's "Celebrations".
Because that's the way it works. They have mortgages and ministers to pay, before you even get to charity.
Everybody knows they have expenses; the question is whether such expenditures are necessary or desirable.
The local Quaker meeting meets in a private school. They pay a fee, but nothing like what they'd pay for a mortgage and upkeep on a building. They have no plans to buy land or construct a meetinghouse, being content with the present arrangement. Having no clergy, they obviously don't have any paid clergy. What are they missing?
I see that others have interpreted this as being about the Priest's wages. What about the services that this priest performs for his parishoners?
What about them? Are they separate from his service to God? Is it proper to sell such services?
Just preaching? No. But ministers devote their entire lives to their congregations, at the expense of holding down another job.
Do they, as part of this total dedication, remain unmarried and childless? Is it possible to be dedicated to your congregation while bringing up children, but not while holding a job? Why?
Are the paid staff the only people who are devoted to the congregation?
The Mormons don't pay their bishops or stake presidents. Do you think this makes them less effective? Do Mormon congregations suffer from this arrangement?
I don't necessarily object to paid clergy. When I was a Christian, my priest supported himself and his family by working as a public school teacher. It made for a very full day, every day. It wasn't always easy for him. I can see the advantages in having a paid clergy; I just object to the idea that a paid clergy and a mortgage are necessary operating expenses -- not to mention the fact that some clergy are paid very well indeed. I know a number of Christian clergy who make in excess of $100,000 a year, and I'm sure there are megachurch pastors for whom 100 grand is peanuts.