Wait for it... It depends.
IDK about "helpful". You can properly gut load your feeders whether they're homegrown or store-bought. Can't say that homegrown are any "better" otherwise. YMMV.
Economics depends on how many mouths you're feeding (how many reptiles you keep).
For just one or two, IMO breeding feeders isn't worthwhile—it
IS an investment and ongoing commitment of time & re$sources. OTOH, if you're breeding reptiles, it probably doesn't make sense
not to breed your own feeders.
I think some people undoubtedly find it "rewarding" in different ways. Everyone's different—whatever gets you up in the morning.