Just checked the stats on your latest tweet (https://twitter.com/LenKendall/status/304626304391737344)

Here´s the bit.ly stats for the link included in that tweet: https://bitly.com/ZjYhUz+

Bit.ly analytics show 20 clicks in the last hour.

$75 for 20 clicks is a CPC of $3.75.

Obviously the click rate will change depending on the nature/timing of the tweet, but seems a bit expensive to me.