Do you know what cocaine sells for?  $60-85 a gram in Eugene.  That's an "8 Ball" or about 8 ounces.  They may have been getting the $100 per gram Portland price, being out there on an island and all with limited sources of supply.     

You can leave behind some camping gear if you made good money on the drugs you brought with you.  

http://www.narcoticnews.com/drug-prices/cocaine/retail/