Jamie Wolfer says a dessert table with varied flavors gets eaten more than one heavy on vanilla and chocolate. Bright, tangy options like lemon or berry appeal to guests who skip sweets. More variety means your money on desserts actually gets consumed.
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If you want your guests to descend upon your desserts like a pack of raving hungry locusts, give them variety. If you want to make sure that the money you're spending on desserts actually is consumed, then you want to make sure that you're giving them enough variety that they can have fun with it, that there are different flavor options. Like, I for one am not a huge fan of sweets. I just am not. But if something is lemon flavored or berry flavored, you can bet your bottom dollar I'm gonna try it. But if it's like super vanilla-y or like really chocolatey, it's not that I don't like those flavors, I just won't be inclined to try them. So the more options you have on dessert table, more people will try them.