Bits of both. They pillaged their way across Hungary, to such an extent that that they were banned from the country and some were held to ransom for good behaviour. The Byzantines set up subsidised markets for them, but there was still plenty of pillaging along the route. Alexios kept a large army under his son in law with them to ensure that things did not get out of hand. When they could no longer buy food, during the trip through Asia Minor and during the siege of Antioch, they pillaged where they could. However, they suffered terribly from hunger with thousands dying from it since Kilij Arslan went ahead of them, burning fields so they would not have the chance to steal. Similarly at Antioch the crusaders besieged the city through the winter, when there was little food to be had as is, and Yaghi-Siyan prepared well and gathered in supplies before the crusaders arrived. Many of the leaders of the siege were sent out on extensive foraging missions looking for food and almost as importantly, fodder for horses. many of the horses died and if I remember correctly Raymond of Toulouse had to buy some from the Emir of Tripoli for a truly extortionate price.