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Sad fact is that healing spec for any class means your soloing days are effectively over - that's the balance - you can either effectively heal people or effectively hurt people, not both.
That is true. And it is such an enormous flaw in the design of this game, it's a wonder Blizz didn't realize yet.
DPS classes/specs have always been abundant, and it's no wonder. You can kill, solo, grind/farm as you please. And let's be honest, those are pretty much the things you do the most in this game.
But then people need healers... but who wants to do that willingly, knowing that your soloing abilities will be dramatically reduced? Well, some people do, but not enough to create a good ratio.
Sorry for the huge rant, just wanted to talk about it a bit.
Now, I can't speak from a Resto Druid point of view, but I can speak from a Holy Pally point of view. I did Mining/Engineering so basically I'd sell some ore and do dailies like people already suggested. Some of them don't involve killing much, if at all so while you may not do all your 10 quests each day, you can still get some decent money over time.
Alternatives to Mining are Herbalism on some servers and Skinning in some cases, though it may not be as effective. Ore and herbs are the two resources that will always be in demand. Ore is used by a lot of professions in different ways and people will always need tons of potions.