Lol, I want some of that homegrown stuff ;) If you have the talent and resources to write this kind of program, then you're saving yourself a LOT of time and money.
However, for the rest of us, it's not advisable to buy such a program unless you're willing to invest significant resources acquiring it and having it customized.
At the Internet Marketing Conference in Vegas, at a workshop with rep's from many engines and directories, they said they are really trying to crack down on free submits because most of it is spam and they spend too much money and resources "spam guarding". So it would make sense for them to crack down on auto submitters that faciliate the blatant abuse of the free Add URL. This allows them to focuse their time and money on enhancing their search technology instead.