Dividend income from a typical , well balanced and structured , au share portfolio is a very stable and reliable income stream.
Dividends fluctuate in a stable and quite predictable fashion.
Even through difficult times such as 2009 , dividend streams were not greatly affected even though the share valuations had plunged.
That's all true. But the CC provider would have to take a look at your specific portfolio, and satisfy themselves that you don't have margin loan, before they could conclude that your particular dividend income stream is stable/reliable. They would also have to assume you are not selling down part of your portfolio as time goes on, but many people are doing that, and those people most certainly are affected when values plunge. IME, the CC providers just don't bother going into this level of detail, instead they just assume that there is a certain level of risk associated with income of this nature. Just like they assume you're not going to get a bonus, even if you have received a bonus every year in living memory.
All I'm saying is, I don't think that's particularly unreasonable. In fact, that's pretty much what I do for my own budgeting purposes. Obviously others disagree - fair enough.