The way I see it, the parties who may want to pay to write me an email are the ones I don't want to read anyway.
This is pay to play to contact someone - more akin to donors paying politicians for access at a dinner.
For every legit paper mail, I've had 5-10 garbage leaflet advertisements shoved into my mailbox by half-legally working teenagers earning $1-2/h in exchange for everyone's annoyance. 99% of these went into trash immediately without looking.