It realy depends on the server... Most servers (green/yellow) will pay arround 500k~ but it can be up to 2kk (thats the most expensive that a have seem sold so far).
Some places you can see people trying to sell for 5kk or so, but it never actualy saw it selling for theses high prices, since "Unrealized Dreams" drops a lot from bosses like Mawhawk, Omrafir and Gaz'Haragoth.