So , hang on
Groupon get you 98 houses lets round 1 house to one hour as they are ment to be £24 and dont forget they are dirty first cleans,you could maybe do them in half an hour but im sure moral will be low since you are making only £4
so 98 hours you are paid £392 minus your travelling time well thats 2 weeks work after travelling costs and other costs you are earning well below minimum wage.
the only person i see benefits is the customer and unless i read it wrong i also find it hard to believe that you have 100% conversion rate you only cleaned 27 and 27 have chosen to pay you 3x more then they just paid for a first clean for a maintenance clean.? that doesnt sound right please confirm.
Groupon may work and if it works for you somehow thats great,
but i do know the numbers game , i also know customers very well are you certain that 27 are staying on your round and willing to pay you 3x more for a maintenance clean or did i read it wrong ? i know for a fact if any of us clean a house for £8 first time very few will agree to pay us so much more for a maintenance clean?
98 houses can be door knocked quite easily if you had the time in about 45 hours even sooner if you walk fast and if you pick up 98 houses at 1.5x the clean of £24 for example that's £3428 on the first clean alone , even if you are left with 70% on maintenance clean do the maths i just don't see the point of working for £4.
you do need to add the 45 hours canvassing to your first clean hours of in this case 98 houses so at most 98 hours probably 40 mins (moral will be high) but lets just say 98 hours plus 45 hours 143 hours in exchange for three and a half grand or 98 hours in exchange for 392.! not being funny but i can not imagine them sticking after only paying £8 for a £24 job logically if you picked them up yourself and charged them £35 on first clean you will have a higher stick rate,so you having a high stick rate is weird!
unless you use contracts of some kind before you knock out that first clean customers should say ,, Cheers for that we will call you if we ever need you", or thanks for letting us know that we can join the round we will let you know.
if you dont like doorknocking or leafleting and if most are willing to pay you 3x more and if it really does work and customers are sticking in your area , i guess you should keep doing it maybe take a loss on the first clean and employ just to get them done faster
i know for a fact it wont work in my areas and many areas cos
it would be THANNKS, YOURE A STAR , BRILLIANT JOB ,SPEAK TO YOU IN 3 YEARS

Good luck thou!
p.s hope this post makes some sort of sence , its 3 am friday night , just got back from a night out with the mrs.! gn!