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15 spam mails do seem quite much to me. I blacklisted addresses for less.

If they're getting filtered, who cares?

> Social networks complaining of not being used

This is my biggest one. I get more spam from Facebook begging me to log in than I do from almost anything else. I haven't used the account in about 7 years, you'd think they'd figure it out.

> you'd think they'd figure it out.

Cost of sending spam: Effectively zero.

Cost of pissing off inactive user: Essentially zero.

Cost of convincing inactive user to come back: Positive.

Add in a bunch of other factors like some product manager twisting stats to make it look like they are getting users back even if they really aren't and you see why it happens.

I have a few old domains I registered in the late 90s, and some of them still have the mailto with my email, some I rarely get any spam, and others it's dozens a day. SpamAssassin does a great job of caching the spam.