When it comes to Pick-5/6 virtually every system will cause you to hemorrhage money big time.
You may win the first time you play, or years later or never.
Some systems, like a broken clock has the right time twice a day, may prove correct if you are at the right place at the right time.
What works in one place may not work everywhere.
The most important facet of any system is whether it is capable of winning the game you play. This means back testing it against past draw history. While past wins may not be an indicator of future success, what else have we got to go by?
Avoid system authors selling magic systems with no facts, where you need to act right away to get a price break. Make good use of lottery software free trials to test before you buy and only buy if you can make the software win in the past for you. If you can't make it win knowing what the correct answer is, you can't expect it to win for you in the future.
BobP