So yolo, that's an amazing thing you're doing, setting up a new charity. And that's how charities tend to start. Now... What if your charity does really well with fundraising, starts to bring in bigger and bigger sums of income. How are you going to decide how to spend it? How do you rely on volunteers (I'm a volunteer at a charity myself) to deliver the things you need to spend it on. How are you going to accommodate the growing volunteer numbers. Who's going to do your admin? Your taxes? Your Health and Safety? How are you deciding to spend your money? What processes are you going to implement to prove to your donors you're spending it well? What's the impact of the money that you've spent to improve that specific cancer outcome? Are you sure you've spent it in the right place? (Kids Company - yikes!) What about that fundraiser volunteer who was a bit random in the way they went about fundraising and broke the rules? You've done so well you've got 5000 supporters on your books. Are you sure you're adhering to data protection laws in the way you manage their data and contact them? You'd like to write an information booklet about that cancer. Are you sure it's up to date? You know that if you spent a couple of grand on a local advertising campaign, it's likely to generate 100,000s of thousands in the long run, and maybe some more volunteers - do you do it, or will you be guilty of 'overheads' and looking like a 'professional' charity?
The best charities all grew from little seedlings, of people like you who were passionate about what they wanted to do. And if you're successful, what comes with that growth is the need for an infrastructure that usually requires employed people, offices and things like IT.
Not all of it is great, but most of it is made up of small charities gone big, trying to manage spending the money in the best way but being expected to do so in the right way, therefore having an infrastructure that looks like business sometimes.
I will be thrilled if you come back in 15 years to tell us your charity is doing well. And would be surprised if it doesn't have some of the characteristics you hate of 'large charities'.