Yeah, but regardless of what you believe...there isn't some set amount of money to be made that excuses people not paying for their copy.
As an anecdote, I once lost my Wii Fit disk; but since I registered my game with them they verified it was mine and sent me another copy, free of charge. My hard drive failed before I could de-authorize my CS2, but Adobe took all of five minutes to give me another authorization when I asked.
The point that I'm trying to make is that it is highly unlikely that every pirate tried to contact said company and was rejected. No; there's a better chance that they lost it and then decided to pirate it instead of talking to the company. What information does that give the company? If a large portion of users were losing their copy instead of just being pirates, the companies would add in extra measures to ensure they didn't lose money on incidents like that. Lack of communication with the company just means that buyers look like pirates.
Now, here's the problem with using the Humble Bundle to try and somehow justify piracy:
1. They put 0 DRM on it.
2. They made it absurdly easy to download: fill out the form, pay, done.
3. You could pay them .01. To put it in perspective, most people don't even pick up pennies they find on the ground.
4. They actually paid for some people's copies when they couldn't figure out how to use the form.
Now, let's look at your reasons for why piracy happened.
1. Someone made a direct link to the download in a forum somewhere and people are too lazy to go back and fill in the form.
That sounds about right.
2. No means of paying in your country and/or no access to a credit card.
That sounds about right, too. However, that is no justification for piracy. If you can't pay, you can't have it. It's sad that their country doesn't have paypal, but the 'no access to a credit card' bit is absurd. No parent or friend could really afford a .01 transaction? Really?
3. You already paid for it once and wants to download it again on your spare computer or monitor.
Cute. Except that they offered you infinite downloads after paying!
4. You're a thievin' moneygrubbing pirate.
Yes, yes you are.
Most people don't pirate because the price is too high. They pirate because there's too many game they want, and they can't afford them all. So, they pay for some, then pirate the rest. Or, in the case of the Humble Bundle, they pirate because they are flaming hypocrites. Humble Bundle listened to pirate complaints: DRM, difficulty of download, cost. What did they get? Piracy.
Point B is, again, not true when pointed to the Humble Bundle. Furthermore, most pirate products are inferior. Only a very small handful of games have crippling DRM, and by very small, I mean maybe ten. I tried pirating Silent Hill 4 once, and the end result was a whole slew of minor issues that weren't present in the official version. I also required ISO mount software; unless I also chose to pirate it once the demon was finished, I'd be out money on that, and there is no justification for the piracy of it!
This is, again, tough shit. There's a very fine type of pork only made in Spain that costs $100 an ounce; I'll never be able to taste that because of the country I live in, unless I go over there, and I damn well won't be able to take it back with me. That does not mean that I should get someone to grab me a full ounce and bring it to me so I can enjoy it. It's not some absurd God given right that we have, to be able to use everything in the world. We need to stop acting like it's our right.
And finally, tough shit. What do you ask them to do? Mail their pennies to the company selling the Humble Bundle? People would pirate it because they were too lazy to send it! Blaming a company for offering every means possible for online transaction is just plain pathetic. Suck it up and stop being so damn entitled!