What will I never get that I actually want?
I'm not as big a collector as som ... I have just one Botcon set (purchases recently), no Lucky Draws, and no rare G1 stuff. I think the rarest TF I have is the Bug General.
I think Superlink Galvatron G is the only one on my list that has reached "just not worth it" status. I already have Energon galvatron, so I have the mold. The colors on the guy aren't as great, IMHO, as Energon Galvatron, so whenever I see him on ebay he tends to be just overpriced enough that I just can't bring myself to get him. I keep hoping I'll find him incomplete and, therefore, cheaper.
Another is Convoy Perfect edition. Again, I have the 20th MP Prime and even though the Megatron gun broke and the paint on the legs chipped

it's just overpriced enough for me not to be able to justify the buy. My shelf space is VERY limited, so the trailer would just go into storage. So there's no real point to getting it ... ugh. I want it, though.
Lastly would be the Kiss Players Sparkbots. The Kiss Players has some wierd stuff, which is part of the appeal. Unfortunately, this set is extrelely limited. Around $500+ last time I checked. And, no matter how awsomely strange they are ... they are just not worth $500+. I'd feel ripped off paying $100+ for them for what they are, truthfully, but I'd be willing to pay that. Five times that amount? Just no freakin' way. On the plus side I did locate a KO of Zangetsu (or the mold anyway), which I bought quickly.