Just to add a possible reason behind a dealers' outrageous comment that they should all wiggle & are on springs:
I took a stall at a militaria fair a few months ago to sell off some surplus items, never done one before or since.
A guy was worried about the early & salty HJ i had with practically no wiggle. He asked if he could show it to some other dealers to get their opinion, which was no problem with me.
Later on a collector i know told me what happened. Two dealers (one who i have spent decent money with & expected better of) told him it was too salty & maybe even dubious with the non wiggle diamond.
Then, suprise suprise, they both tried to sell him one of their HJ's!
Therefore it could just be a dealer trying to keep his customers spending with him rather than anybody else.
The other option is that he's a complete idiot!