REBD is one of the cheapest UR card trader cards out there. Literally just one UR gem to get. Hardly a problem at all.
Apophis I kinda agree, but it's such a crappy card anyway, not worth spending UR gems on, not worth farming (pretending that it becomes an Odion drop).
The real problem is not the cost, the real problem is that both Yugi and Kaiba has their signature card as drop, but Joey is stuck with a Gilford instead.
ALL characters should have their signature card as a drop. The fact some arbitrarily don't have a UR as a drop at all is dumb. Why are Insect Queen and Harpie Lady Sisters level-up only? Apophis was probably justified originally, but now it should be a drop. Rex would need a non-REBD Ultra, though. Or at least LOB Red-Eyes or something.