<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I don't know if a price exists that would balance the risk of spam while<br>
still attracting users<br></blockquote><div><br></div><div>$0.10 per account (assuming they are terminated quickly) seems to be high enough to stop bulk spam campaigns, although accounts do still get bought and sold at this price level.</div><div><br></div><div>Of course micropayments like this are hard to do directly, even with Bitcoin these days (though I'm sure we can push mining fees down with enough work). But that's what phone verification is for.</div></div></div></div>