At first glance, of course not. They give us gold. How could more gold make us poor?
The problem is that gold isn't very useful on its own. What does it do for us? We certainly need some for training and dual spec and repairs, but those are really quite limited. A daily and some vendoring would balance those out.
But don't we need gold for flasks and gems and enchants? Not exactly. Those all require trade mats of some sort. Gold is only needed for the training portion and that is minor. Gold serves only as a lubricant, a way to keep goods flowing, but it is not needed for the actual creation of anything.
Gold is the oil in a car. If your car stops, is your first response to change the oil? Of course not. That would be stupid. You're more likely to check the gas. So then why do we keep changing the oil in WoW?
Dailies drive inflation. It's quite simple, and quite stupid. We have no gold and prices are high, so we do dailies and now we have gold. We buy something and put even more gold into the economy, driving inflation even more. If we had instead farmed a material, sold it, and then purchased what we wanted, we'd have added no gold. But we would have added a trade mat.
What is truly greater wealth, gold or materials? I say materials. Gold has uses, but past vendor luxuries and oiling the economy, it has little actual use. But materials, those make our flasks and armor and enchants and gems.
When you farm gold, you only drive inflation and add little value to the economy. When you farm materials, you actually reduce inflation (AH activities destroy gold) and add value. The new materials help drive the economy as well, since they give people reason to spend gold, by buying materials and buying what is crafted from them.
You will never be rich by grinding dailies. You may have a lot of gold, but will you have wealth? None. Until you spend it. But then your cherished gold is in the hands of someone else. In all transactions there are those who give away gold and those who take gold. If you spend all your time giving away gold, you will spend all your time farming gold to compensate. Instead, find reasons for people to give you their gold. How? Farm something they want. Craft something they want.
There's already a ton of gold out there. Rather than add to it uselessly, take some away in exchange for useful goods and services. Cut some pie. It's delicious.