The title basically says it all. Why can’t we post images in our signatures or in a thread post? I do understand that there are people that post inappropriate things on forums but really? I don’t know, maybe it’s not that big of a deal to everyone else as much as it is to me. I like to show people the pictures themselves rather than links to the pictures. It just seems to be easier.
I imagine it is just easier to manage if they don’t allow us to have the option. I know the admins can if they choose to though.
Image spaming is worst!!
I imagine because it adds one more thing that the moderators have to handle. In addition, images will increase load-times for pages (even if you have a fairly fast connection) and may even “break the page”.
Just a couple reasons. 
If they make it so we can put screenshots in our profile you could put a link to it in your sig. If it isn’t a screenshot then I would suppose you would have to put it somewhere else on the internet and post a link.