The Domain Business - Want domain X Inquiries?

I have a few domains, maybe 500 to support the business. 

Most days, I get an inquiry like this one:

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Tracy S****man <tracy****man@yahoo.com>	1:50 AM (12 hours ago)
to john

Hello,

I think that you are the owner of a similar domain name and I am wondering if you would like
to obtain the mytime4learning dot net from me?

Thank you for your time and have a nice day.

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What do I do with these emails?

I often ignore them but then they keep emailing for awhile.

I sometimes am interested and then my first step is to see if the domain that they are offering is available. Often it is. So I ignore the approach and go get the domain directly from a registrar for $7 per year.

In rare cases, I go back to the vendor and try to agree upon a price. In some cases, we've done a deal. But in most cases, they hold out for what I think are absurdly high valuations so we negotiate for awhile and then it falls apart. I try to NEVER talk to them on the phone or let them get my direct line since many of these people are like mosquitoes, once they find you, they just keep at it.

There's another email that I get less frequently (which I can't seem to find a copy of right now).Typically, it's from a major foreign country and they say that someone has tried to register a name like mine (Time4Learning.china.co) and to help me protect my copyright, they would offer it to me first. So for $xyz, I can have it but I need to act fast.

I've never ever answered any of those emails.

Your experiences with this?