To put things in perspective, in 1997-8 I sold my window cleaning business. It was turning over £1,500 per week. I split it into three rounds at £500 a week and got £10,000 for each one - £30,000 total.
OK. the potential annual turnover was over £70,000 but it was full time, 7 hours a day for each round to make about £24-25,000, but I had no trouble selling it and all the buyers were happy with what they got. Two of them are still running their businesses and the third re-sold at a profit.
Experienced window cleaners on here are not likely to pay those sort of prices, but for someone looking for a ready made business with guaranteed income from day one and no experience of building a business for themselves, anything like this is a bargain.
Never sell yourselves short