provided the work they are doing is priced accordingly, its needs to be high quality work and presumes they take no holidays - so in a word - no.
3 people should manage.
£33k a year turnover is only £717 a week assuming you take 6 weeks for holidays.
A good wfp'er should make £150 - £200 a day easy enough = £750 to £1000 a week provided they have the work to do in the first place.
Well priced compact work will bring in more and not so hot work will bring in less, obviously.
As for 2 people working TOGETHER bringing in 100k I reckon its very unlikely unless they are working full time hrs on well paid commercial jobs with very little travelling time between jobs.
But I'm no expert - each guys work is different and each guy works differently to the next.
I expect my guys to complete £700 a week each - which they do - easily.