I'm particularly interested because a lot of websites I go to say that they were independently landed but then to on to say that "geneatas, the peasant aristocracy who paid rent to their overlord." If these were the highest among the various class of ceorl I find it hard to imagine a lower class churlish would own land. Also if they owned the land why would they have to pay rent for it?
Partly you pay for protection which your thane provided for you.