This is the biggest reason why Pyrovores suck. They shouldn't use a FOC slot or something, then there's a small chance that you'd see them every now and again. No way in hell is it worth it to lose Hive Guard, Zoanthropes or Venomthropes for Crapovores. About the only time I can see Pyrovores being worth their points is if the Tyranids are the Attackers in a Planetstrike game where you can at least Deep Strike in without a Mycetic Spore and set fire to some entrenched infantry.My other big problem with them is that they compete for arguably the most important slot for Tyranids. My elite slots are always filled with either Hive Guard, Zoanthropes, Venomthropes, or the Deathleaper and I don't see my self making room for the pyrovore any time soon.