I had a donate button on my website for the longest time along with the feeds. I got a few donations the first year it was on there, and nothing after that. It did help pay for an antenna and put the rest towards some feedline, which all went to the scanner feed, so the donations were put to good use!
If you do so, just remember to clearly word it that it is a donation, not a subcription or guarantee of service in any shape or form. This day and age one can never be too careful.