I am very into baked-goods photos (I have them for screen savers), and so I can very confidently answer this

IMHO, the best, most tempting baked-goods photos are "realistic" ones. I especially want to see pies/cakes sliced—the rest of the cake/pie can be in the background to show off pretty decorations or lattice tops, but I'd be far more tempted to buy such if I saw the cake's layers and buttercream filling, or the oozing deliciousness of that pie filling. Ditto with muffins, biscuits, rolls and scones. I'm fine with seeing them whole in the background—in fact, I want to see the whole ones steaming in a basket...but I need one in the foreground opened and dripping with butter, or topped with jam (ahem-memberphoto-ahem). Even with cookies...they can be displayed by the dozen in the background, but in the foreground I want to see at least one cookie beside a glass of milk
Don't get me wrong here, I like the staged photos too...my screen savers include some stunningly beautiful photos of fancy fruit tarts on gold filigreed plates that you'd expect to see at a wedding, and artful cakes perfect for holiday celebrations. And if you're selling ones for weddings or holidays, those I'd stage as pretty as possible.
But for those not slated for weddings or celebrations...I think they should look real and tell a story: that slice of pie on a gingham napkin, or coffee cake on a 1930's diner plate, complete with a fresh cup of joe; or a fruit crumble in a mason jar that's being served at a picnic or a homemade donut with a bite in it beside a book and cup of tea. Those would make me, at least, want those baked goods...so much so that I'd either buy 'em...or bake them up myself