First of all, DVD is SUPPOSED to make money. So is Disney. Their attempts to do so are not 'greed.' The primary responsibility of a company is, within the realm of legal behavior, to return a profit to its investors/shareholders, not to make people feel warm and fuzzy. Now, one of the best ways to do the former is to do the latter, but not always. Foremost, the business must sustain itself. If it doesn't, then the investors lose their money AND the public loses their warm-fuzzies.
Similarly, it's not greedy for DVC to attempt to equally represent the interests of ALL of its owners. Under the old system, some people were getting a large number of days for a disproportionately small number of points, some people were getting a small number of days for a disproportionately large number of points, and some people were getting shut-out entirely. It would be irresponsible for DVC not to attempt to re-balance the system. If Disney makes more money from these changes, it will be a natural result of the system working as it should, not greed.