You must be doing it all wrong dave, after all (apparently) the more you invest the bigger the return!
What you need to do is this-
Go out & spend 20(ish)k on a new van (after all, this is peanuts). It must be BIG, the BIGGER the BETTER, yes BIG, you'll regret it if not, as when you expand, yes, EXPAND, at an empire building rate you never thought possible (with just a magic wand that spits water) you'll be using 2000Ltrs per day.
Spend another 10k (just nut shells) on a top notch HOT (this is a must) system.
Sign writing, uniform, a few staff & you're made for life dude, it couldn't be simpler mate.(could it?)
Once customers see how proffesional you look they'll be throwing themselves at you AND wanting to pay much, much more above the going rate just to get on your books. Trust me dave, i get this all day long, infact i'm taking on a minder next week just to clear my path.
I've a few tips on swiss bank accounts too but i'll give you these next week when you'll need them.
Hope this helps
Tony