As a daylily lover (which we all are), one part of my brain says: if you have seeds plus space = plant! Why not? The bees have come up with many spectacular plants ... based just on sheer numbers. And yes, with 400+ seeds, the odds of having something you really like goes up.
As a (very small-time) breeder of daylilies, I have come to dislike not having the full background on seedlings I am growing. When you do get something really nice, it's irksome not to know 'where on earth did that come from'? Would I kick something out of the garden, if it's beautiful, just because I can't track the full history? No.
And if you are growing daylilies because you just love daylilies (not a commercial grower / breeder / seller of daylilies) and you have a place to grow the seeds out (and time and energy to pursue this) then plant them. Any daylily seed, left unplanted, is 'potential' that is wasted and lost forever.
The 'Peace' rose came out of a field of thousands of heirloom roses, and changed the history of roses forever.