In addition to the various reasons mentioned in other answers why the greeting and hand waiving isn't welcome, please note that a hand with splayed fingers is a rude gesture in certain cultures (or at least in mine):

Please don't insult me every time I visit the site. Not only is this exactly the kind of noise we strive not to have here, it is actively insulting your users or, at least, your Greek users. Please don't. If you absolutely must have this rather pointless thing, at the very least please make the fingers be close together and not spread out.

In addition to the various reasons mentioned in other answers why the greeting and hand waiving isn't welcome, please note that a hand with splayed fingers is a rude gesture in certain cultures (or at least in mine):

Please don't insult me every time I visit the site. Not only is this exactly the kind of noise we strive not to have here, it is actively insulting your users or, at least, your Greek users. Please don't. If you absolutely must have this rather pointless thing, at the very least make the fingers be close together and not spread out.

In addition to the various reasons mentioned in other answers why the greeting and hand waiving isn't welcome, please note that a hand with splayed fingers is a rude gesture in certain cultures (or at least in mine):

Please don't insult me every time I visit the site. Not only is this exactly the kind of noise we strive not to have here, it is actively insulting your users or, at least, your Greek users. Please don't.

In addition to the various reasons mentioned in other answers why the greeting and hand waiving isn't welcome, please note that a hand with splayed fingers is a rude gesture in certain cultures (or at least in mine):

Please don't insult me every time I visit the site. Not only is this exactly the kind of noise we strive not to have here, it is actively insulting your users or, at least, your Greek users. Please don't. If you absolutely must have this rather pointless thing, at the very least please make the fingers be close together and not spread out.