I think the reason is friends gotten with twiends are temporary and most of them are not even real. You need to follow people manually and they'll click on your link to your site.
If you use tweinds, i'm sure that you can up your followers very fast and drop very fast as well. Don't waste time and money on that. I would suggest you to use tweetadder which is much more better and organize. It can follow the people according the target keyword and location. Then you wish them to follow you back. After sometime, you able to follow them back. For those did not follow you. You still able to auto unfollow back them after 3 days. i feel this software is amazing and build the fastest followers.
To get some faster traffic from twitter you have to open a profile about hot information, for example music album or so.. Then with using of some software to get followers from twitter groups relevant to your profile..
I send a welcome message to each of my followers, that's the most of the traffic. Also regular messages along the day can work. Keep in mind a tweet has a lifespan of 1 hour so it's essentiel to post a lot to be seen. But Twiends followers aren't of good quality, they only follow you back automatically without checking out your account. http://www.getmorefollowers.biz has a nice method to get followers you could try.
Use the Twitter search bar to input keywords that are relevant to your market. Follow other people who have more than half following than followers--good chance they'll follow you back.
I got 60,000 followers myself and only get 12-15 clicks per tweet and a 3 or 4 sales each week. I've noticed if you become active you can increase clicks and sales.