First I've seen this thread. If you put stuff on your bike and don't like it and want to sell it go ahead. I personally will not delete your thread. If you buy an item and decide you don't like it and want to sell it before you even mount it. Go ahead. I personally wont delete it.
But... if you order a bunch of stuff in bulk and then post a bunch of items up for sale. Like a vendor would. And you are not a vender. And a member brings it to my attention. Then yes, that is the type of thread I will personally delete.
Keep in mind, even with all of this, I need to hear a complaint from a member before I will delete that type of thread.
But that is just me. Can't speak for anyone else.