Default not a lot of custom roms???

going to get my tmobile moto x in a few days, there doesnt seem to be many roms here, why? most them are for verizon dev version.
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Nexus 4
AOKP

HTC Evita T-MOBILE
MagioRom
Beastmode Kernel
S-off | 2.14
TWRP 2.3.3.1