You can distribute this plugin and claim the authorship. You will get instant HUGE traffic and backlinks with this Wordpress Plugin, just submit it on plugin directories.

This is the screenshot:

There are 19 currencies that you can choose, and suggested amount. You also can make a "welcome" text to make the visitors interest in donating the site owner.

I will not sell this plugin again, and buying this means you own this plugin.

Live demo:

Start Bid: $50
Inc: $5
Buy it now: $100.

Feel free to ask questions here.