I confess, I'm confused about this thread.....
I don't think it is common for churches to sell goods. Occasionally, there might be some books for something and the church asks for a donation to cover the cost.... but I don't think even that is common. Last Christmas, my Lutheran church asked individuals to donate Pointsettia plants for the altar area ($6.00 each - cost) and then we could take the plant home after the Christmas service, but I don't see that as exactly selling stuff and again, there was no profit involved.
In my Catholic parish, they constantly had fundraisers (for the parish, for the school, for various groups in the church such as the youth or Knights, etc.) and I did get a little tired of the persistence of this, but these were fundraisers for charity, to help support various ministries. I wish people would just donate but there was a bit of a culture that they had to get something (an overpriced hot dog or bag of popcorn or lasagna or pony ride) for their donation. But while I though the fundraisers "overdone" I didn't see it as making the church into a business, I think it was simply efforts to fund ministries: the people involved were all volunteers and it was all for worthy charities. Parish school kids selling overpriced candy bars didn't seem to be so much different than girl scouts selling overpriced cookies... both are efforts to fund good things, and one certainly may not participate by not purchasing such.
In almost all churches, there is a "stewardship" emphasis once a year. My church has 3 Sundays in the Fall dedicated to this. But I find this very biblical; the Bible has a LOT to say about the godly management and use of our time, talents/gifts and money. Yeah.... one can see self-service in this (it is to the parish that this use of time, talent and treasure is typically directed) but it's not exclusively so and it is quite biblical. I think it's important to remind people of godly stewardship and to not think everything revolves around the growth of the kingdom of self.
My probably off-topic half cent.
- Josiah