Sadly, I don't use Paypal. You can make a donation to your local hackerspace with the $100 that you will soon lose.
Good luck.
PS. Have you ever asked the people you have interviewed what they think about the process?
Almost without exception, people who don't get hired never hear back from a company as to why. Yes, I know all about "everyone's afraid to get sued for saying something wrong". So... develop a neutral feedback form to candidates as to why they were passed over, skills the interviewer(s) thought were lacking, etc. This will mean that people can get better, perhaps get another job (yes, maybe at a competitor, but also maybe somewhere else entirely), and continue to earn income, pay taxes, and contribute to society in a productive way. Some people can contribute without a job, sure, but right now most people need jobs.
Telling someone "we're sorry - we had 8 candidates apply for this position, and we ended up taking on someone with more experience in X, Y and Z compared to your experience level. We wish you the best of luck in your job search". This would be courteous, professional and helpful all at the same time. Between my own experience and that of several colleagues, fewer than 5% of employers ever provide something even remotely useful in terms of feedback.
How do we expect the job seeking population to get better without providing feedback mechanisms for them to learn from?
And what about the cases where your reasons are not "more experience in X, Y, Z"? Cultural fit is a biggie - one might turn down a candidate who is more qualified because his banking attitudes would go over badly at a startup, for example.
Companies don't seem to realize that treating applicants bad is just as detrimental in many cases as poor customer service. I've had bad experiences with job application processes, and I've told many people chapter and verse about the companies involved. If they can't even treat people well who want to work there, how will they treat customers after the money is received?
If unskilled candidate X gets "other candidates had more specific skillz" while uncultured candidate Y gets "sorry, you suck for unspecified reasons", it sounds like a lawsuit risk.
Specifically asked? I've received lots of feedback from people who made it through the process. They've added to my bag of interview techniques here and there. In general, they appreciated a hiring manager who spent a lot of time and effort fielding good people. Those kinds of comments tend to be a bit self-selecting, though.
I've had a couple of candidates who didn't make it get frustrated with the process. One in particular lost his cool just trying to pseudocode a routine to determine prime factors of the input or something like that. If you lose your composure doing something like that, I don't want you in the trenches with me late at night when we have a demo to show to customers the next day and something isn't working.
When people have asked me for feedback on why they weren't made an offer, I've always tried to be as candid as possible; especially when it seemed that they were sincerely trying to improve. Screw HR and their obsessive need to CYA.