@MntMan YOU are the blind one, with your tunnel vision and focus on JTR only. As stated before: JTR is NOT the only deciding factor for being able to clear heroic STR. As previously stated death trooper is an MVP as well, also farmed from a 16 energy cantina node, yet you consider him a fun farm while vets are boring?
If a guild only needs 25 ChexMix teams teams to clear phase 3, they will have 25 surplus DTs for phase 1. If players slack in phase 3 and only do 1—2% dmg each with their ChexMix teams they may have to use all of their DTs there instead. Broaden your mind a bit. If you don't have many JTRs in your guild then work around it.
If your guild mates just like you never bothered farming for JTR, then it is definately your own faults that you don't have more available and have a harder time in heroic sith raids. If people leave your guild, it's because there's a mismatch between their ambitions and effort and the contribution and effort of guys like you. If people leave then you apparently didn't have a strong enough community to keep them in the guild. This is NOT a game design problem. It's a YOU problem however you twist and turn it.