There's been some good points made and i would like to echo those that say learning to clean traditionally is the way to start.
It's very hard work and a shock to the system for most entering wc, but until you learn how to deal with and overcome problems using trad methods you aren't really going to be equipped to offer an all round service.
Also, the posts concerning diy are valid.
They have set the benchmark for manufacturers to follow and because of diy'ers the costs have come down enormously which has benefited those that choose to buy a system off suppliers.
When you look at the replies to those posts asking wfp questions the majority of answers come from the diy'ers and we have those to thank for most of our knowledge gained on the forums.
There are some superb suppliers as well (we all know who they are), who have raised their game to accomodate the majority of us who want to buy parts and not just systems.
This wasn't the case as much when i 1st joined the forums. I never agreed with it but was amused to see matt getting slagged off for offering free advice by the people who had spent loads on systems.
It doesn't happen now, i'm glad to say. Matt and others defended their corners, refused to get bullied off the forums and they have been vindicated by how things have progressed.
I got sidetracked there.
The biggest drawback to wfp for the time being is the customer who doesn't like change and will criticise your work as a reason to dump you instead of telling you they don't like wet windows and sills.