That may be so but with no other systems using DDR1 these days the availability of the RAM is getting more and more scarce which is of course driving prices up.
I hate new systems that upgrade to hardware that is becoming more and more unavailable.
Really? Even DDR1 would be a massive waste of bandwidth on an 040/060 system, and none of them would be much cheaper for practical Amiga capacities than used PCxxx SDRAM.
(Though DDR1 would at least be useful for a G4 upgrade.)