Why does the TMNT have "secret" events?

[Venom]

I was just thinking back to past events held for the Turtles, most recently like when Turtles Forever was previewed a couple of years back, and it got me to thinking: why doesn't Nick, Playmates, and IDW have a collaborative effort to make the Turtles' comeback a huge event?

Why does it seem like the Turtles are always secreted away into a corner where only a small handful of people will even see it rather than having a huge blowout presence where everyone can see "Hey, the Turtles are BACK!" or even in the past, letting them know that the TMNT were still alive and kicking??

It may be just that very thing this year a spectacular announcement, I've never been to a con so I'm not sure how the politics work, but it just seems like the TMNT franchise has always been relegated to small pockets of secret events.

Any folks who frequent cons care to elaborate and offer opinions/insights?