Quite simply because I'm sick of telemarketing. I will not answer any unknown number on my phone, especially a private/with held number.
Its cheaper in terms of time and frustration to rather call back if its a genuine caller who left a message.
I'm fortunate in that I'm not directly in sales so can afford to do this. My sales guys are not quite as lucky and I often hear them trying to fend off these terriers.
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