As a petsitter, I'm so glad to see the voting on this! We look after your dogs - walking, feeding, playing, cuddling, comforting, letting them sleep on our bed if that's what they're used to, and making sure they're safe and well. It can also be giving medication and care. I'm the one who has to take your dog to the vet if it becomes unwell and solve any problems that arise. Not only that, but I'm taking in parcels, watering plants, often mowing the lawn or doing bits of gardening, and keeping the house secure by being in it. With dogs, I usually can't go out any further than the nearest shop and back (and sometimes not even that), and I can't have friends or partner round. I pay for all my own food while I'm there.
Honestly, I charge more than £40 per day and for two dogs I think that's an unbelievable bargain. You can get people to do it for free but you have to have a nice house in an interesting or beautiful area, and accept that they may leave your dogs for 4 - 6 hours (or more) a day so that they can go sightseeing. By contrast, I'm trained in animal first aid, fully insured, and experienced with all kinds of animal care, and I stay with your dogs 24/7 because it's my job, not a holiday. I think I'm worth what I charge and honestly I would charge more if it weren't for groups like 'trusted housesitters' who keep the prices down.
Luckily, my clients appreciate what I do and I don't need to beg for business from people who don't value the service. I turn down sits from people like you, OP, because I don't believe you care enough about your dogs and that leaves me and them in a vulnerable situation when you go away. Good dog owners find a way for them to be cared for properly when they're away, whether it be friends, family, kennels or a sitter.