Have they not paid enough?

Obama's fundraising was phenomenal, the amount raised from public donations over the period outstripped anything either Hillary Clinton or John McCain could get with all their contacts; but now the election is over and victory is his its over... or not. The fundraising goes on:

"In the months and years ahead, we're going to accomplish amazing things together. No president has ever had the support of such a powerful grassroots movement, and Barack and Joe will need you to continue fighting alongside them. But before we take the next step, we need to get our house in order. The Democratic National Committee poured all of its resources into building our successful 50-state field program. And they played a crucial role in helping Barack win in unlikely states like North Carolina and Indiana. We even picked up an electoral vote in Nebraska. The DNC took on considerable debt to make this happen. Make a donation of $30 or more now to help the DNC pay for these efforts, and you'll get a commemorative 2008 Victory T-shirt"

Now one would imagine a lot of people are all donated out (pardon the phrase), is it too much to pay more for a 'product' you have already 'bought'. If we do consider the investment many must have made, is not a further $30, T-shirt or no T-shirt, a little too much to ask before any return on that investment is seen. While it may be far better than being funded by buisnesses or shady deals on yachts or with stolen money, is there a limit to how muc people will donate after the big event has come and gone and been won?