brotherhood_of_LAN - 1:43 am on Mar 6, 2013 (gmt 0)
Welcome to the forums EJIqpEP
$125/m is a great starting point and I'd imagine it pays your server & domain costs no problem.
When you say 'useful' I would not undervalue the service you're already offering. Clearly there is a market for the links you sell and you're being rewarded accordingly.
If you're looking for a new goal, what kind of work are you wanting to do or already specialise in. Have you considered looking at sites like e-lance to trying and earn more cash from your existing skillset?