a combination.
buying in bulk can also save money. Plus, I like having a stockpile (many customizers have stockpiles of baits and hair lol)
but sometimes I need a specific pose that I might not have. depending on gen/pose this can be hard to find in bait condition. I do FBRs, so color doesn't matter to me, but for those who don't, that's an added challenge on finding the right bait sometimes.