Well, I have been lurking here a long, long time. I respect the right of people to create things (and sell them if they find a buyer) but I have to say my eyes have been opened by the spoiled and babyish way some of these 'creators' have reacted.
Selling information? That smacks of telemarketers--another whole group who should be destroyed. Childish rants about how you are some uber, alpha being and the rest of us are scum? What the hell?
I really can't stand drama queens or people who set themselves up as 'super people' because they make computerized items. Yes, a lot of pay stuff is great, but there is a whole lot of free stuff just as good or better.
I have not paid for custom content because I'm cheap and like value for my money. While I admire many of the items you can buy, I can't see spending when I have generous friends who share with me.
Once you spend your money, you have the right to do what you want with the items. If that means emailing it to your best friend or posting it, well, it was paid for.
In addition, the vague replies from EA/Maxis/Whoever they are confirms to me that yes, this is just a game, and no, they don't care what's going on with these pay sites.