Spike worked hard to get what he has. He's managed to gather a hoard without angering anyone, harvesting it from hidden treasure troves or long forgotten caches. He's found a cave set far enough from anyone who would see him as a threat, with a hell of a view, and making it a point not to start anything with what little civilization is close enough to know of his existence. He could just lay back on his gold, relax, read his comics...

...or he would if all these mares would stop showing up!