Almost all websites allow donations. I mean, why wouldn't they? The hosting itself and running a website can get quite expensive and unless you're taking advantage of AdSense or other methods, you will struggle in the financial area. That's why donations can often help with the maintaining of websites.
I have donated only once to a blog so far. It was a few years ago and it was animals focused blog. One of the shelters opened it and they were accepting donations that went towards the care of the animals. I didn't mind donating since it went to a really good cause.
I am curious if any of you guys ever donated to a blog before? If yes, what were the reasons?