What is silly about building your own? Explain? If rsync works for you, why would you buy Dropbox? “Why Lamborghini when Honda” is equally as silly yet I’ve seen them race head to head. Honda won.
There's nothing silly about building your own. What's silly is declaring a convenient, user-friendly product to be pointless because it's possible for a skilled person with a lot of free time to build their own.
If you want to build your own Dropbox with rsync, go wild, have fun, we'd all love to see what you come up with. But I don't have time for that. My family doesn't have the skills for that. Dropbox is great for us, and building our own is not a realistic alternative.
I don't agree with the grandparent comment... I don't think it's silly.
But building your own doesn't scale to all the things. For everybody who wants to build their own X, the same person doesn't also want to build their Y and Z.
They will eventually need to buy some products. So there will generally always be a market for pre-packaged solutions.
For example: someone building an app may need network storage. They may not also want to block the building of the app on the building of the network storage.
