Hi DaveW,
I would second Jeff's comment. The Super-Lite Pole are great to use, but generally are aimed at either the more experienced user or those who do commercial work. Due to it's modular nature it can be a little more challenging on domestic work.
Most people start off with something like an 18ft Universal pole which will reach everything on ordinary houses and because it is light can even be used on a downstairs windows.
If wanting to reach slightly higher windows then a good 2 pole strategy would be a 24ft universal pole (for the higher stuff) and 12ft extender pole (for most of your work), as it's very light and maneuverable.
High earnings are possible, but it will take time to reach this stage. Buying an expensive WFP system will not 'automatically' get you into this bracket.
Alex