I'll state where I'm at on this: I have sold some of my signed cards, including some that were done TTM. However there are fairly specific guidelines that I use during this process.
1. I only sell if they offer to buy it from me and/or no trade could be reached by me and the other party. This means that, depending on how it played out, I at least attempted to trade it to them first or they have no intent in trading and would rather buy it from me.
2. In conjunction with the last statement, I do not openly sell my autographs on ebay or like sites. A lot of you mentioned this in your reasons for not liking autograph sellers, so I'm making sure to state this, and do so early on.
3. I price it fairly and don't try to rip people off. That means that the super easy signers of 2015 are priced at $1 + shipping cost. I figure the card, my time to acquire the autograph, and my time to prepare the request is worth that.
4. Most cases the cards I do end up selling were acquired through a 50/50, in person, or by trade. This is because those purchasing the item(s) don't have the same opportunities as I do and therefore have to use monetary means to add them to their collection most of the time.
5. I rarely buy myself, but when I do I always look for a good price that I just can't pass up and is something that I want to keep.