but that means I see them often.  And those friendships are 'limited'.  Can't have a relationship with someone I never met.
Agree this guy it over the top.  Dump him.
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This will likely never go away and the guys that think it means "carte blanche" because they have your number or e-mail address is mind blowing, but they persist. He's a low grade stalker for sure and if he's waiting to see you in '11 tell him to send a pre-donation as a means to facilitate your meeting. It might turn him off just enough to leave you alone.

If I were you. . .

When he tried to make an appointment 9 months in advance, I would have told him to call back in 8 months. That ought to put him in his place. He feels like he is your client now and that you are obligated to keep him company.

By the way, despite my alias I'm not a provider.

I think you may be over-reacting

You have control of the situation. You can simply not answer his emails, take a week to answer them or even send him an email that says "You know, I don't have time and interest for chit-chat, so if you could knock it off, that would be swell."

Don't play the wife game. You know the game where a wife expects the guy to be a mind reader. As you said, this isn't the love connection. So if it isn't the love connection, just state your preferences outright, albeit tactfully. I would hazard a guess that, once your preferences are expressed, he will comply with them. Most guys have no desire to creep someone out and only do what they do because they feel encouraged to continue. Throw up a barrier he understands to actually BE a barrier, and he stops.

The reason I think you are over-reacting is that you have not reported taking even the most basic steps to ameliorate his behavior; and now think of him as a "stalker type" because he hasn't read your mind.

Now, you may think what you are stating is entirely intuitive and universally applicable. But it is not. There are providers I've seen only 4 times, spread out over a wide time frame -- and who I don't even see for sex anymore, where we've met each other's respective families &c. Every person is different. It's not always strictly about fucks for bucks.

So while your admonition may well be true for yourself and *generally* true; keep in mind that his behavior may be based upon interactions with other providers who don't see things the way you see them.

As such, it is incumbent upon you to state YOUR specific desires and make them clear. Or, you could even make a statement on your website: "Only 4 emails total will be answered prior to meeting. All others are unread." Or whatever. It's up to you to figure out how to state it tactfully.

So simply tell this guy your feelings.

If you state it crudely enough, granted, you'll turn him off and lose his business. But if things continue as-is, you'll likely turn away his business anyway -- based on your possibly erroneous feeling that he is a stalker type. So there is nothing to lose by *communicating*. And if you do so in a somewhat tactful fashion, you may even be able to retain his business AND skip his emails!

Just tell him that.

I'm crying TEARS of laughter...

Might hit a sensitive spot for some, but her writing style truly has me chuckling. Hope the laughter offends no one!!

On a more serious note, can't knock a guy for wanting ya! However, it is really hard to keep up and your pain is felt! Even with friends, it becomes hard to keep up...

He's not a timewaster.  He plans his annual trip to the US months in advance.  His emails are always polite and courteous.  If there's a change in his plans that could affect your date with him, he's considerate enough to send a heads up.  

He's not a stalker.  He's a very nice gentleman from another country eagerly anticipating his trip to the US.  
He's as polite and courteous in person as he is in his emails.  I'm looking forward to seeing him again in February.

If you're uncomfortable with his emails or PM's did you consider bringing it up to him first?  Perhaps giving him an opportunity to adjust to your level of comfort?   That would have been a tad more business-like than kvetching about it here.