No because sell groups typically aren't selling carries through progression content (at least from what I've seen).
No because all fights are different.
No because some people don't care about doing endgame but still want their clears (i.e. they won't come back to the content right off).
No because sometimes you can be capable but unable to find a good group.
Those are just a few reasons. That being said, I bought Titan EX and T5 wins ages ago and have regretted it ever since. Yes it was hard finding groups and I don't think there is anything morally wrong with buying carries. However, it didn't really help me meet my goals because I don't want to get a clear and forget about the fight; I want to really know what I'm doing and I want to have the social connections to go back and farm or help others if I want to. I don't find lying in the dirt while others beat the fight for me much fun. Although in both paid groups, I perfectly executed mechanics and never died.
Anyway, I've since learned those fights really well and helped multiple people clear them. The gil I spent on a group was just a waste. It hurt me but I think the rest of the community is fine
