Drop parties don't normally change prices on lower things, but instead by dropping holiday heads, it makes it so that some of the poorer members of the economy can get a chance to have more money. The only thing that lowers during a holiday drop party is the price on Cyp and Noobcrew heads if those are dropped.
The best you could do is get a get a group together and all of you change the price on something and keep it that way for a while and try to get it to catch on
He mean a silked horse spawner if im not wrong. Since anyone can create a placed horse spawner with a horse egg.