I agree that there needs to be more, but it has gotten better over the years. I've been a member here since 2010, and for the first couple years the only way you were gonna see belly/bellybutton was if someone ordered a custom dedicated to that spot. Belly/bellybutton content in any other way at times was a rare as a four-leaf clover. But as I said, it's gotten better. More fans of that type of that content have joined here, and also more producers are at least paying some attention to that spot. Something that bugged the hell outta me for years and still bugs me today, is when someone being tickled who has had their belly/bellybutton tickled before, has that spot totally ignored. If a model specifically tells a producer not to tickle there, then okay. Because there are some who don't like having their bellybuttons touched. And obviously a producer is, and should, respect the models wishes. But I can't tell you have many models I've seen over the years who have gotten their bellybuttons tickled before, have it totally ignored. I've even seen producers find that the bellybutton gets a good reaction, but only stay there for a couple seconds.
I get that feet are the top seller. I've honestly developed a foot fetish myself during my time here. But cases of the belly/bellybutton getting ignored are always disappointing.