a couple of issues.
1) inherent in the whole DVC set-up is a built in feeling of entitilement....this is due to the fact that unlike your run-of-the-mill guest, a DVC member has made a significant investment, and does (wether cast members want to know this or not) have an ownership interest....this does not excuse any fool who is rude to staff and is classless enough not to tip. emphasis added with greenban
My experience is that these people are the exception to the rule. This is also why generalizations are a very dangerous thing. Yes people can be rude, but there are over 60,000 members, and i take it the "jerk" list does not have 60,000 names on it.
2) there is also the issue of familiarity.....most people staying at DVC resorts are repeat customers....they have a set expectation, and are more likely to point out deficiencies that they see. Most first time tourists may not know that something is even amiss....peopel who have familiarity are much more in tune, and expect the same level of "magic" per se then your average customer.
Therefore there ought to be an expectation that a DVC customer will be more high maitenence then a regular customer (again, not excusing the zipperheads).....However i would tend to guess that DVC customers are probably very reflective of the rest of the poulation, and due to these circumstances listed above, may seem to be more demanding!!