Monasteries of the medieval / renaissance time period usually had very large complements of lay staff and tenant farmers, who maintained the estates and produced goods for both internal use and sale at market.
This is not to say the monks didn't work or didn't follow ascetic regimens, but they weren't doing all the work of keeping the monastery running.
This is not to say the monks didn't work or didn't follow ascetic regimens, but they weren't doing all the work of keeping the monastery running.