Asking for donation on your blog has it own advantage, with donations you can be given any amount depending on what the donator want to give it might be less and it might be high , donation means asking for support from your blog readers to help donate for your blog t o improve you blog performance and also help in contribution your own researches , donation is supported by payment processors such as Paypal, Alertpay and Google, you can ask for donation with Paypal and alertpay by visiting their website account
For bloggers users you can put Google donation on your blog by going to layout section and selecting add widget Google donation is among the widgets.