I suggest this because the others effects of this hat like - burning flames, scorching flames, Sunbeams etc are priced around 27-38 keys. And the similar effects like circling heart, like - circling tf logo, circling peace sign, cloudy 9 etc are priced around 11-13 keys.

And the buy order of this unusual is at ~7 keys. So i don't think that it should be priced at 40.72 keys. My opinion is, it should be priced around 13-15 keys.