What other business could you invest £18k and immediatley be earning £2.5k a month?
one where you'd pay the correct amount of 3x maximum perhaps ?? 
people like you make me laugh :
THE CORRECT AMOUNT??? UP makes these rules up???
you can not say a round is worth 3x its monthly value has every round is different some are alot more proffitable than others. If some one offered me 3x for my round i would simply laugh in there face and continue to make a large profit while i watch them struggle trying to build a round.
MY round is 4 years of hard work sweat and blood and i now have A BUSINESS and its worth as much has any chippy, garage, warehouse or company that makes the same kind of profits.
?? "rules ??" . . not rules, it's generally what people pay for a round (If they're sensible that is)
why pay £18k for a round if you can get the equivilent for £7k ?? that's a lot of difference.
plus, what assurance have you that the customers will keep you on ?? generally, people don't like change. Most will keep you, but nothing's set in stone. I know people that have lost a lot of bought work !
if you've never done window cleaning before and suddenly jump into a round, how well are you gonna be cleaning the windows ?? You're bound to make mistakes. It's
never garaunteed work.
maybe I've been fortunate, I don't know, but I bought £1500 a month of work that averages £40p.h that I paid £1000 for. I had a further £1000 that I paid a month's worth for. I know I got a bargain but I'd never pay more than 3x for work. I know 6 window cleaners who have bought some work lately, ranging from 2 to 3 times the monthly amount. On this site, people generally offer work for between 2 to 3 times.
I live in the real world, that's why I suggest 3x to be a fair amount.