sure this breaks the copy and right-click implementation, but most of the users dont need it and will just do a normal click to get in touch. If this is the pain i need to go to receive zero spam mails from page-crawlers, i go for it. Advantage to img-solution is full use of css fonts and text aligns. Also any js-solution which would render the plain email into the DOM will receive spam, as crawlers do already execute js before parsing (also think of SPA).