Have to disagree, we have 9 working for us now, the window cleaners are all paid piece rate and it works very well and they are well paid.
Yes, entitlements change, but you just factor those into your prices, as for the the hassle, there isn't a great deal, just deal with t as it happens.
I could never have the lifestyle I have now if I worked just by myself. I went on holiday last week, came back on friday and everything is still ticking over nicely, money has gone into the bank and they have picked up, priced and done 14 new houses whilst I was away.