Hey Jacksfly,
I'll give you the benefit of the doubt and assume you're really interested in an answer, and not just trolling for flame-bait. So, with no profanity, hyperbole, and only a little bit of sarcasm, I'll attempt to give you an honest, non-emotional answer.
Not worth anything. I know stuff like this sounds tempting. We've all been sitting there with wet ink on our commercial tickets, wondering how on earth we're ever going to get any flight time built up. To an outsider, Boeing time certainly seems much more valuable than light twin time. You have to ask yourself though, where do you want to go with your career? If you give those hooligans your hard-earned cash, you're going to have 660 hours. What jobs will you be competing for with 660 hours? Regional Airline pilot? No. Major Airline pilot? No. Freight Dog in a light twin? No. Indentured, institutional FO for a scumbag freight 727 operator with no hope for ever upgrading, making any money, having a life, or ever being competitive for what few "good" jobs there are out there? Quite possibly.
400 hours in the right seat of a transport category jet, will do very little to develop the skills of a 263 hour pilot. After 400 hours, you'll barely be keeping pace with the rest of the crew. (Going through the motions, NOT situationally aware.) You'll be able to wrestle the AC around on a nice VFR day, mostly using the autopilot as a crutch.
There a very few shortcuts, and this is not one of them. What you should do is build your time and work your way into the right seat of an RJ. Or build your time and weasel your way into a charter outfit as an FO flying Lears or Westwinds, or whatever. When I say build your time, I'm talking about the good old-fashioned way of working hard and getting paid to be the PIC. (Instruction, pipeline, traffic watch.)
I sat in the left seat of 5 different models of Learjets for four and half years. I had the pleasure of taking a lot of great folks for their first flight in a jet after training. Given the choice between a 1500 hour freight dog, who's been slogging it out in the crap with no radar, by themselves, making all the descisions, and some PFT person who has 3000 hours of being a bird strike protection for the Flight Engineer, I'm picking the first one. And I'm not alone.
Please don't make the wrong choice. Drop me a PM, I've got lots of other ways you can get started in this industry without screwing up your professional development.
Look at it this way, are you really going to give your money to a bunch of loosers who have the website of some 11 year-old stamp collecter? (Not even that nice!)
Try it this way dude, post what these losers have told you here, and I can guarantee we'll expose them for the scumbags they are.
DO YOUR RESEARCH! WE CAN HELP!