You're picking a very few stories out of a much wider context. The Daleks and Davros, in the case of the Fourth Doctor, they appear twice in seven years, covering a total of ten weeks, or two and a half months (give or take). In seven years. The same can be applied to the others.
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O to be wafted away
From this black aceldama of sorrow;
Where the dust of an earthy today
Is the earth of a dusty tomorrow!
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