You've got it pegged right on, Check Raise.
There's only ONE reason anyone wants low minimums and high maximums - because they think that they "thought up" a winning system that has to do with doubling up your bet. I'll bet you really actually believe that you thought this up all by yourself!
Even if you DID think it up all by yourself, you will be the 17,873,426th person that "thought this up". As Check Raise said, this is called the "Martingale System".
Do yourself a favor and do some on-line searches for "Martingale System", and READ about why the system DOESN'T work! (As opposed to finding out the hard way and throwing your money down the drain!)
No matter how you slice it, if you are trying to beat roulette, you WILL lose. If you're lucky you won't lose right away, but it really won't matter. Eventually you'll go broke.
Try to beat roulette at your peril.
OK - I didn't read the "Additional Details". Sorry for that!