Aww that's nice of you to reward your referrals with an upgrade. I do that with my referrals as well, I've upgraded two so far
Congratulations on your achievements so far. I'd like to have 100 referrals by the end of June aswell.
Little tip for you to reach $100 quicker, try to do as many tasks and offers as possible. Check out the TokenAds wall, the videos, there's usually 4 each day, which okay is only 4c but all adds up.
The tasks, well as you can see I'm in the running for being a winner in this weeks task contest. Try to do the "Write an Answer" task, whilst it pays little, the bonus for writing a good answer makes it a very profitable task.
Good luck on achieving your goals ptcchamp!