youd want to find out which is the rarer variety. there were 2 versions, mesannas rose of deah, and messanas death rose. it wont effect price alot if theres bout equal amounts of both, but if one is alot rarer than the other it would, maybe by 50-100m or so.
i sold my GL, Mesannas rose of Death for 150m when they first came out because i knew there would be alot more of them. its a pretty good looking item, and even tho i estimate totals for the winning "rose" pumpkins id say itll hold value at around that amount.
basically just depends on if people get tired of them and decide to sell. i dont think price will ever go lower than 75-100m