Is this a legit reason to start a Go fund me account?

I currently cut grass for an awesome family in my church. The man has terminal cancer and is unable to mow his lawn. I approached him and asked (the question we all ask) if he and his family needed anything. He actually responded with a yes. He isn't able to mow his lawn and has been depleting his funds fighting the cancer. So I offered to do it. The down side is that it's 3/4 an acre and I push now it because that is all he and I have. I've been doing it all summer and it's been a huge blessing. It has also been stressful trying to manage his lawn and my own during my limited time at home. I've been considering starting a lawn mowing ministry for my church and wondering if a gofundme account would be a legit thing to do for a ridding mower. I feel like it may be a selfish request, but I could mow more lawns in a fraction of the time. What are your thoughts. Is it worth the effort of should I suck it up?

TLDR: push mowing lawns suck. Trying to help a church family and take care of my own. Would a gofundme account be a selfish idea to buy a ridding mower?