My mistake, no need to snap your cap.Jetbikes are Troops. They're probably the most complained about Troops in the entire game, and for good reason.
I still don't think they are a great starter troop choice, when compared to Dire Avengers or a Guardians Squad with a Weapons Team. To me the Eldar box seems more suited to expanding a collection than beginning one. If I were going to start an Eldar army I would buy a Farseer, two Dire Avenger boxes and the Start Collecting Box, rather than just the Start Collecting box as I could/would with the Militarum Tempestus, Necrons or SMs/CSMs.