Gaba Corporation - 1st Interview

I have been sending in resumes to different companies and finally got a response to one. I already know quite a bit about Gaba, and have considered all of the warnings against working there. The thing is, if they're going to sponsor my Visa, then I'll take it. Right now my prospect is going to Japan without a job and hitting the pavement. OR I can take a job with Gaba, have the Visa, and have something of an income. Here's how Gaba works:

-You are an independent contractor - meaning they don't pay any insurance or benefits. They won't even pay for your transportation (virtually unheard of in Japan).
-You submit your availability every month and then their "clients" (your students) will book lessons with you. If you don't get booked, you don't get paid. So basically the income is not guaranteed.
-They pay you so little that many consider it below their dignity: 1500 yen/lesson. Unpaid mandatory training, unpaid vacation, unpaid overtime.

Okay, so negatives aside, I see two shining beautiful opportunities:
1. Visa Sponsorship!!
2. Flexible Scheduling!!

So I might not get a lot (any) benefits and my pay is scraps. The good news is, if they hire me, I'll be legally able to work in Japan. That means I can use that visa to apply for part-time kindergarten jobs at small schools (the kind of job I really have a hankering for!). If a school hires me, I simply tell Gaba I cannot work during the hours the school needs me. I still fulfill my obligation to Gaba, and I have supplemental income.

People also complain about unpaid training. I'll just call it FREE training. I have paid for a TEFL certificate, which I am still working on and very grateful for it...but at least with Gaba I'll have additional training that I don't have to pay for, experience in a field of which I have a measly 3 months (in Chile), and it's a way to get to Japan.

I would, of course, like to hear from Epion, Kohgakusha, or Interac. It hasn't happened yet and I have turned in resumes a week ago. I want to "weigh my options", but I'm a beggar...not about to be a chooser!

So I have my first interview via Skype with Gaba tomorrow night. I plan on preparing but as this is my first interview for a job of this kind I'm kind of lost. I plan on having my notes from when I taught in Chile handy, studying my resume and cover letter, and perhaps journaling some answers to questions they might ask. I've heard that almost all of them ask "why Japan?" and "why this company/methodology?", two questions I've kept myself up at night thinking about. I really have faith in myself and hope they will see some potential in me.

Well, wish me luck!