Everything I've heard and according to the rules says that linking to another site, particularly if it's for TF2 trading, is against the rules. Exception being rep and reference links. So then we have the awesome dispenser site (not giving url for obvious reasons) with automated trading using bots. Would be great to link people to your shop so they can trade your bot if you're offline, and some people do. But is this not against the rules? I don't know because I've reported several over the past month or so and none of the trades have been closed. So is it against the rules or can I link to my own shop?