Is there a minimum you must spend on your draft card?

Say it's an $80m league. How LITTLE can you spend, initially? Is there a minimum? Could you, in theory, put down 25 sub $1m players on your draft card? Anyone know? :)
http://forum-365.strat-o-matic.com/archivesn/
http://forum-365.strat-o-matic.com/archivesn/viewtopic.php?f=13&t=65318