Dream weaver,
In a nutshell you answered one of your questions yourself.
"The problem I would have though is as people can rent these out why would they want someone to use the same machine and charge them for it.
If for example"
Your budget of around £500 to be fair is not really going to get you a great deal!!, sure you will find a used machine for around £500 and their are a few advertised on here from time to time , I would suggest taking a look in buy and sell section, and the majority you can be assured will be described honestly with their integraty on here been on veiw
, but their really is alot more expense to be considered. Chemicals of different types, tools of all descriptions ,insurance and a large part of the budget ADVERTISING to name just a few.
Not trying to put you off, because it can be rewarding with the effort , time and hard work you have to put into it, especially in the first few months ,even years.
A good suggestion would be to find a c/c near you who is willing to show you the ropes that way you will see what is involved.
Like you a number of years ago I was in the same situation, fortunatly a well respected member on here mentored me, taught me lots helped me with countless problems even the loan of equipment, and in the end it payed off.
Some may say , why help a possible competitor ? others will say plenty of work for any decent c/c if you try hard enough........... and in this game you will find most c/c tend to help each other whether they be 50 0r 5 miles from each other .
so good luck, but I guess a little more financial input may be needed.
geoff
ps. Take a look at the Truckmount challenge thread